Chapter 173： In an avalanche, no snowflake is innocent

Wang Xiurui found a total of six surveillance video materials.

The first surveillance video.

"This was discovered by a surveillance camera at the entrance of the Commerce Plaza near Li Wei's house."

Wang Xiurui began to introduce.

"There is a shoe repair shop at the entrance of this square. Through our visit, we probably learned the time when the shoe repairer appeared nearby."

In the video, the shoe repairer pushes a bicycle.

The bike is relatively old, and the rear seat should have been modified.

There is a shoe repair box.

But because of the angle, the cobbler's face was not captured in the video.

"Has the cobbler's face been photographed in the rest of the video?"

Wang Xiurui shook his head and looked at Chen Yan: "Chen team, in the video we found, this person's face was not captured by surveillance cameras."

Kacha.

Screen switching.

"Only this video captured each other's eyes."

Video playback.

The cobbler still has his back to the camera.

However, when he got up and packed his things, the side face of the cobbler was captured by the camera...

"He's wearing a mask?"

Zhang Yaoming looked at the video showing only one eye, and was surprised.

"Yes, Team Zhang." Wang Xiurui nodded.

"During our visit, we found that the shoe repairer was always wearing a mask and sun hat."

"No one has seen what this man looks like."

"Not only that," Chen Yan walked to the screen: "This person is very cautious."

"Every time he chooses a shoe repair place, you see, it is always in this kind of corner."

"There are very few surveillance equipment around, and even if there are, only his back can be photographed."

"And the cobbler's hand."

"This person has been wearing gloves and has not shown a single bit of skin."

"Everyone, look here again."

Chen Yan pointed to the edge of the shoe repairer's sun hat with his right hand: "There are six video surveillances, and there is not a single video that shows this person's hair showing."

"And ears..."

"Even eyes, there is only one..."

Chen Yan stared at the eye in the video carefully.

Dan Fengyan, very attractive.

But it was this eye that made Chen Yan unable to distinguish whether this person was a man or a woman.

"You...can you tell if this person is male or female?"

The crowd frowned.

They couldn't answer Chen Yan's question.

"I've asked a few shoe repairers and they have had access to this shoe repairer."

Wang Xiurui stepped forward and walked to Chen Yan's side with a solemn expression: "These shoe repair shops are actually opened in a certain order."

"On adjacent streets, two stores cannot be opened."

Chen Yan nodded.

Now, shoe repair is not the same as it used to be.

Don't say that the shoes are worn out, that is, they are worn out and may be thrown away.

Therefore, if a shoe repair shop wants to have a business, it must cover a wide range.

If there are two or three shoe repair shops on one or two streets, how can people make money.

So does this mobile cobbler.

If you enter other people's territory, people will definitely ask.

"But this cobbler doesn't communicate with them at all."

"Just pack up the booth and leave."

"So, we have no way to determine whether this person is male or female during the investigation."

Wang Xiurui paused for a while, then continued, "However, judging from the figure of this person in the video, he is about 1.7 meters tall."

"The probability of being able to fiddle with so many shoe repairing things should be higher for men."

"However, I see that this shoe repairing equipment is not light in weight... If it is a woman, it should be less likely."

Chen Yan is also more inclined to this judgment.

It's just that the eyes of this...

Chen Yan was a little uncertain.

But anyway, it's an important clue.

At the scene of Song Pengcheng's spontaneous combustion, Chen Yan carefully examined the half of the corpse.

The burning of the corpse can first be determined from the outside in.

Moreover, Song Pengcheng's body was burnt to the upper body, and the calf and soles of the feet were carbonized.

Looking at it this way, the fire should be burning from the upper and lower directions, towards the middle.

This is rather strange.

Judging from the burn marks on Song Pengcheng's body, the ignition points should have been scattered.

However, how did the burning of the soles of the feet begin?

Moreover, Chen Yan found a long mesh-like scorch mark from the residual flesh tissue of the scorched calf.

Similar to the radioactive web-like traces produced after being electrocuted.

At that time, the autumn rain in Feng County was a drizzle, and there was no thunder at that time.

No lightning strikes were seen, either.

So, where did this trace of suspected electric shock come from?

"Now, has this cobbler appeared?"

Wang Xiurui shook his head: "We visited the shoe repair shops near Li Wei, Chen Pingping and Wu Jianguo and said that we haven't seen this shoe repairer in the last half month."

"The time of his appearance is probably concentrated in the interval between September 1st and 15th."

September 1st to 15th...

During this time...

Among the spontaneous combustion events, the earliest occurred on September 19.

That is to say, if the other party deliberately planned, it should have completed the preparatory work on the 15th.

"Captain Wang, next, you must continue to track down this shoe repairer."

Chen Yan began to make work arrangements: "If the other party really has a problem, then the planning may have been completed before September 15."

"In the later stage, it is very likely that it will not appear again, but..."

"The mobile shoe repairing car used by the other party is not newly assembled. Someone must have used it for a long time. Find this mobile shoe repairing car!"

Chen Yan turned around and looked at Lin Hao: "Captain Lin, how is Song Pengcheng's autopsy?"

Lin Hao shook his head: "I just asked, it will take a while."

Chen Yan nodded: "Song Pengcheng's autopsy results are very important, let's speed up the progress as much as possible."

Lin Hao nodded.

He understood what Chen Yan meant.

Song Pengcheng was the only one who left corpse remnants in the spontaneous combustion.

His autopsy report is likely to unlock the secret of spontaneous combustion.

Today is the 27th.

Three days have passed since the 24th.

...

The special group has entered the busiest stage.

The work arranged by Chen Yan is very meticulous.

Each group is doing their best to complete their tasks.

Qin Yun was the first to give feedback.

Zhang Yaoming sent out to verify the relationship between Yun Guifang and Chen Pingping.

"Team Chen, the investigation on my side has basically ended."

On the projection is the personal data of Yun Guifang's family: "The hatred between Yun Guifang and Chen Pingping has a long history."

"The specific matter will start from the time when the two fell in love with a doctor..."

The information Qin Yun brought back was basically the same as what Liang Huifang told Chen Yan.

"Yun Guifang's son is called Wang Qiao."

"A few years ago, I went to Shen City after failing to compete for a job at Dan's No. 1 Hospital."

"Currently working in Shenshi Second Hospital, and already the attending physician of the department."

"In the past three months, he has not returned to Dan City. His mother, Yun Guifang, has been taking children to Wang Qiao in Shen City, and has not lived in Dan City recently."

Zhang Yaoming frowned: "That is to say, although Yun Guifang and Chen Pingping have grudges, but recently, the two have not met each other?"

Qin Yun nodded: "Moreover, we also investigated whether Yun Guifang knew Li Wei and Wu Jianguo."

"However, judging from the current investigation results, none of Yun Guifang's family has had contact with Li Wei or Wu Jianguo."

"So, I personally think that the Yun Guifang family... has little to do with the Eucalyptus case."

Chen Yan nodded.

He agreed with Qin Yun's opinion.

There must be a connection behind the deaths of Li Wei, Wu Jianguo and Chen Pingping.

However, since the Yun Guifang family has no contact in this regard, they can temporarily consider reducing the degree of suspicion.

After Qin Yun's report is over.

The one who brought back the news was Wang Jian.

Wang Jian was the detective sent by Zhang Yaoming to search the houses of Li Wei, Chen Pingping and Wu Jianguo.

"Team Chen, Team Zhang, we have made a major discovery!"

Wang Jian, who rushed back, was very happy, and the expression on his face was very excited.

"What did you find?"

Zhang Yaoming got up to meet Wang Jian and asked anxiously.

"That's right, Team Zhang, our group was divided into several groups according to Team Chen's arrangement to inspect the three families..."

"First of all, we checked the houses where the three deceased lived."

"However, nothing was found."

"The spouse of the deceased is more cooperative."

"Next, we also searched the house where the children of the deceased lived."

"Li Wei's son is studying in the capital, and there is no housing in this city."

"Cheng Pingping's son, Song Peng's Cheng family, we didn't find anything unusual either."

"Wu Jianguo's youngest son, who teaches in the city's No. 1 Middle School, lives in a collective dormitory, and found nothing unusual..."

"However, we found this at Wu Jianguo's eldest son's house..."

Several members of Wang Jian's team carried a box onto the conference table.

"Chen team, Zhang team, please see!"

Wang Jian carefully opened the box, revealing the contents inside.

"Shoes... umbrellas?"

Zhang Yaoming looked at the two things inside with some doubts.

"Team Zhang, these shoes are the leather shoes of Wu Jianguo's eldest son, Wu Jianxiong. Look, these heels have just been repaired."

"And this, the umbrella, is a brand new umbrella."

"According to Wu Jianxiong's confession, the umbrellas were distributed at their construction site half a month ago and have not been used yet."

"As for the shoes, they were repaired by a traveling shoe repairer in front of his house..."

Chen Yan picked up the shoes and umbrella and watched carefully.

At first glance, there are no problems.

There were two brand new studs on the left and right feet of the shoe.

The quality of the umbrella is very good, and it is relatively heavy to hold in the hand.

"Send it to the laboratory immediately for examination."

Chen Yan put the things back in the box: "Tell the laboratory that there may be chemicals in the main umbrella, and be careful to prevent fires."

"And this shoe, be careful when handling it, especially in the heel, there may be an electric shock device."

chemical materials?

Shock device?

"Team Chen, do you suspect... Li Wei and the four spontaneously ignited... This umbrella and shoes caused it?"

Zhang Yaoming is not a fool.

As soon as I heard Chen Yan's prompt, I understood what Chen Yan meant.

as predicted.

Chen Yan nodded: "It's just a guess at the moment... But for the specific situation, we have to wait for the autopsy results."

Four people died of spontaneous combustion.

Everyone was wearing an umbrella and repaired shoes on a rainy day.

This is the only commonality that Chen Yan found in the four videos.

So, here comes the problem.

Why?

Why must it be raining?

The four cases of spontaneous combustion were all in rainy days.

Can't it be sunny?

Could it be that the rain caused the four of them to spontaneously combust?

Give me a break.

It is common sense that rain can put out fires.

Of course, when the temperature reaches a certain level, there are also some specific conditions, such as electrical fire.

After rainwater is decomposed into hydrogen and oxygen, it is actually an excellent combustion accelerant.

But does the human body naturally have such a high temperature?

So why on a rainy day?

Willing to have only one.

That is the umbrella.

Umbrellas are only used on rainy days.

The other is shoes.

Why were all four of their shoes repaired?

The chance of such a coincidence is too low.

So what exactly does the shoe do?

In other words, what is the role of repaired shoes?

Chen Yan made a bold guess based on the investigation of Song Pengcheng's corpse.

"I'm guessing that rain, umbrellas and shoes are necessary for the victim to spontaneously combust in the rain."

"But how exactly did they relate?"

Kacha.

The projection switching is a screenshot of the video before the four people spontaneously ignited.

"Because of the height of the video camera, all the videos are shot from an overhead angle."

"We can't see what's going on under the umbrella."

"When Li Wei died by spontaneous combustion, there were no witnesses around. When Chen Pingping and Wu Jianguo died, although there were witnesses, when they found out, people were already on fire."

"So, we have never known what happened the first time these three people died."

"For example, does the burning come from the inside out, or from the outsider inside."

"Does it start from the top first, or the bottom first, or the middle?"

"It wasn't until Song Pengcheng's death that we figured out this matter."

"When Song Pengcheng ignited spontaneously, Wang Jie, the security guard of Fengxian Hospital, watched Song Pengcheng walk out of the gate and go to the parking lot."

"So, he witnessed the fire under the umbrella that the surveillance did not capture."

"According to Wang Jie's description, he saw a ball of fire, as if it was poured from Song Pengcheng's head."

"And what's on Song Pengcheng's head?"

Umbrella!

Chen Yan pointed to a screenshot of the video: "Yes, it's an umbrella!"

"Moreover, according to the burn marks on Song Pengcheng's corpse, there are several burn spots of different sizes."

"These burns are exactly in line with what Wang Jie described, the light falling from Song Pengcheng's head."

Chen Yan switched the photo again, it was the remains of Song Pengcheng's body: "Moreover, these burn points have burned holes."

"If Wang Jie and the others didn't use three fire extinguishers to put out the fire immediately, the body would soon turn to ashes."

"So, I suspect that several people ignited spontaneously, even with brand new umbrellas in their hands."

Kacha.

Image switching.

It is the shoes of the four people in the video.

"Next, let's talk about shoes."

"I'm going to tell you a hypothesis, if, if there were firelights falling above our heads, what would your first reaction be?"

Chen Yan looked at Lan Feng.

"run!"

"My first instinct was definitely to run and stay out of danger."

Chen Yanyou looked at Wang Jian: "How about you?"

"If I also have an umbrella in my hand, it must be throwing it away, running, or rolling in place..."

right!

"You are right!"

but!

"Li Wei, Chen Pingping, Wu Jianguo and Song Pengcheng...why didn't they run?"

Zhang Yaoming, Lan Feng, and Wang Jian all reacted.

Yeah, why didn't these four people run?

No matter what the situation is, whether it is internal combustion in the body or external causes.

Why didn't the four of them run?

"Could it be because the fire at that time was so fierce that they were burned to death in an instant?"

Chen Yan shook his head and looked at Wang Jian who was talking: "Even if the fire was very big at that time, it was very fierce."

"However, four people shouldn't have no reaction time at all."

"Besides, they not only didn't run, they didn't even make a cry for help."

"Or, not even the instinct to roll around trying to put out the fire."

"This unscientific!"

"Is there...is there any way to keep them from making noise or trying to put out the fire when the fire is burning..."

Lan Feng knew what Chen Yan meant.

When the four died, the fact was that they did not call for help, nor did they take the initiative to put out the fire.

So why?

Chen Yan looked at Lan Feng and nodded: "Yes!"

"How did the murderer do it?"

"Before Song Pengcheng's death, I was at a loss."

Katcha, photo switch.

"Everyone look here."

"This is the lower limb of Song Pengcheng's corpse. On his leg, there are scorch marks showing radioactivity from the Internet."

"This kind of situation generally occurs only after a high-voltage electric shock, the current is too large, and the protein is coking."

"So, I suspect that the deceased was broken down by high-voltage electricity before his body caught fire."

"The body and the brain have been severely damaged."

"So, the four people failed to respond to the call for help or put out the fire in the first place."

"Because, before they caught fire, they were in a state of paralysis."

card wipe.

Video playback.

"That's why, as we saw in the video, the four of them all became slightly stiff and then burned to death."

Turn off projection.

Chen Yan sat back on the main seat: "Of course, all this is just speculation."

"In the umbrella, what caused the explosion, is there really an electric shock device in the shoes..."

"We have to wait for the autopsy report to get the evidence."

"Also, the shoes and umbrella that Wang Jian found at Wu Jianxiong's house, as long as the inspection results come out, it will prove whether my guess is correct."

...

However, Chen Yan understood.

Even if they figured out what caused the four people to spontaneously ignite, they only solved half of the mystery.

The key is who the other party is.

Why do it.

Since the murderer had planned so carefully and took great pains, he certainly did not kill for no reason.

There must be a reason behind it.

It is important to know the killing method. Chen Yan can arrange for people to find the murderer from the aspects of explosive materials and high-voltage electrical devices.

However, the motive for the murder is more important.

There is no difference between spontaneous combustion and stabbing with a knife.

All murder.

It's just a secret, weird way.

The key is to smooth the entire eucalyptus vein.

And why kill is the first step.

And the most important step!

While everyone was waiting for the autopsy results, as well as the test results of Wu Jianxiong's shoes and umbrellas.

Other news came one after another.

The first is a clue to the new umbrella and shoes Song Pengcheng used.

A group of personnel arranged by Lan Feng is responsible for relevant clues and visits.

"The umbrella used by Song Pengcheng came to find out. It was bought from edible oil."

"Edible oil?"

Chen Yan was slightly startled: "Eight-three brand cooking oil?"

The detective who reported it looked surprised: "Uh... Report to Team Chen, it is indeed the 83 brand cooking oil."

really.

"Go on."

"According to Song Pengcheng's wife's dictation, Song Pengcheng bought the cooking oil at the door of the house about half a month ago when he got off work."

"The oil seller gave me an umbrella."

"That's the umbrella Song Pengcheng used when he ignited spontaneously."

"What about the shoes?"

"This also has results..."

The detective in charge called up a surveillance video.

At the door of Song Pengcheng's house.

Moreover, it happened to be a video of Song Pengcheng repairing shoes.

"This is a video from 11 days ago."

"A mobile shoe repairer who nailed the spikes to Song Pengcheng."

Cobbler!

A familiar figure appeared in front of everyone.

It's just that the shoe repairer in the video still has his back to the camera.

He wears a sun hat on his head and gloves on his working hands.

"It's still him!"

Zhang Yaoming looked at the familiar back in the video with a solemn expression.

"Chen team, this person... Now it seems that there is a lot of suspicion."

"Even if it's not the person who made the case directly, it must be the person associated with the case."

Chen Yan nodded.

Coincidence more, it must not be a coincidence.

This cobbler, who was discovered by the special team at present, was the only person who had contact with several deceased people.

Although, Chen Yan and the others have no video evidence that Li Wei, Cheng Pingping, and Wu Jianguo directly contacted this person.

However, according to the inference of the shoe repair shop around the three people's house, the contact logic can be confirmed.

After all, all three men repaired shoes, but none of them were in a shoe repair shop, and there was just such a shoe repairman nearby.

Using the method of exclusion, we know that the shoes must be repaired by this person.

"Anything else?"

The detective shook his head: "Song Pengcheng hasn't found it yet."

"We visited Song Pengcheng's neighbors, colleagues, and some relatives."

"Everyone reflects this Song Pengcheng. He is humble and courteous. He is very popular in the unit, and he is very appreciated by the leaders. This time he was sent to Fengxian to increase his resume and prepare to be appointed as the Deputy Chief Physician of Keli."

"He lives in a high-rise apartment, and the neighbors are relatively unfamiliar. However, according to the neighbors' reactions, Song Pengcheng nodded and greeted each time they met, and I never heard of any conflict with anyone."

"There is only so much information about Song Pengcheng for now."

The shoe repairer, once again entered the eyes of the special team.

However, at this point, Wang Xiurui has already made every effort to track down the trail of the shoe repairer.

No result feedback yet.

"Captain Lan, how is the investigation of the edible oil?"

Edible oil has appeared in Chen Yan's sight twice.

The first time was when Li Wei was at the funeral home, and he brought cooking oil and umbrellas from the courier brother.

And this time, Song Pengcheng's contact with umbrellas was also related to edible oil.

In fact, this should be a psychological strategy of the murderer.

His fundamental purpose is to ask the victim to get the umbrella.

However, if the umbrella is sent directly, it is easy to cause unnecessary suspicion.

Buying cooking oil and sending umbrellas is different.

After spending money and taking advantage of it, most people will choose.

But if you send umbrellas directly, people still suspect that it is fake.

Is there some kind of deception.

Send umbrellas directly, but it is easy to cause vigilance.

"Team Chen, the news about cooking oil has just arrived!"

Kacha.

Lan Feng turned on the projection screen.

"We have tracked down the little brother who delivered food to Li Wei at that time."

"According to his description, he got the cooking oil from a grain and oil store at No. 36 Binjiang Road."

"There are also umbrellas, but the person who placed the order did not contact him through the software, but directly asked him to take the order over the phone."

"The reward is also cash, one hundred yuan."

"We have surveyed the vicinity of the grain and oil store and found no surveillance."

"The phone number used by the other party is a one-time use, only used that one time."

"Even, we traced the 100-yuan notes collected by the delivery boy at that time, and found no abnormal fingerprints on them."

"The other party is very meticulous. The fingerprints on the banknotes are all erased, and only the fingerprint of the takeaway brother is the only one."

Chen Yan was not surprised by this.

The murderer behind the scenes, the planning time is not short.

Even, it should not be able to satisfy every year or two.

The first is the cobbler.

This person is very familiar with Li Wei, Chen Pingping, Wu Jianguo and even the neighborhood of Wu Jianxiong's residence.

Especially for the layout of monitoring, every time you can find dead ends of monitoring.

Be aware that monitoring arrangements are not set in stone.

However, the other party was able to evade all monitoring, which shows his familiarity.

You can see the timing of his plan.

Therefore, in terms of edible oil, no clues were found, which was within Chen Yan's expectations.

At present, among all the advancing clues, there are still two that have no feedback.

One is to report Li Wei's great practice of living people back then. Lan Feng's group has not sent any information.

One is that people in Wu Jianguo's office who may have access to his umbrella have not yet been identified.

These two points, Chen Yan attaches the most importance to the second point.

Wu Jianguo's umbrella was the only one among all the four that he didn't get in person.

Instead, it was issued by a nursing home.

In this way, it is impossible for the murderer to play tricks before the umbrella is distributed in the nursing home.

Unless he can accurately distribute the problematic umbrella to Wu Jianguo.

Of course, this possibility exists.

For example, if Wu Jianguo's office director is the murderer, then it is entirely possible.

And the remaining possibility is that someone adjusts the package.

The umbrellas in Wu Jianguo's office that had no problems were repackaged into problematic umbrellas.

If you can find this person...

Perhaps, at that time, all the mysteries will be revealed.

Now, just look at the clues left by the other party, how long it can last!

three hours later.

There is exciting news.

meeting room.

The eucalyptus analysis meeting was held again.

Song Pengcheng's autopsy report finally came out.

The task force, each holding a copy of the report.

first line of words.

cause of death.

After being paralyzed by electric shock, burn to death!

Really an electric shock?

All the people in the special group have incredible expressions on their faces!

Li Wei, Chen Pingping, Wu Jianguo, Song Pengcheng, all four died in the self-immolation fire on a rainy day, without any struggle.

"Team Chen... this, this..."

When Zhang Yaoming got this incident report, he felt incredible.

Just three hours ago, although they listened to Chen Yan's series of guesses, they were just guesses.

And now, living evidence is in front of the task force.

The internal detective in charge of the autopsy was Qin Yijun, a middle-aged woman.

"Team Zhang, Team Chen," Qin Yijun explained the autopsy report to everyone in person: "After the deceased participated in the autopsy, there were obvious traces of electric shock inside."

Kacha.

Screen switching.

"This picture is a cross-section of Song Pengcheng's corpse. Look here..."

In the cross-section picture, there is a radioactive mesh-like scorch mark.

"This trace, extending from the two thighs of the deceased, has been upward, causing great damage to the body of the deceased."

"The organs in the abdomen have been broken down, and there are traces of carbonization."

"Although the upper body of the corpse has been coked and disappeared, it can be inferred from the electric shock scars of this degree..."

"The moment before the deceased spontaneously combusted, he was paralyzed by electric shock and could not make any movements."

"In other words, but the deceased can only watch themselves burn, but cannot call for help or put out the fire."

Qin Yijun's explanation made everyone fall into contemplation.

Spontaneous combustion, now it seems, should be a cover-up, or a ritual.

"Team Chen...you are really awesome!"

Lan Feng, who was beside him, stood up at this moment and looked at Chen Yan with a shocked expression.

Lan Feng has few people to admire.

His temper is well-known in the entire Dan City detective team.

Recognize people with strong ability to handle eucalyptus.

In his own right, Lan Feng is the most capable of handling cases by the Dan City Detective Team.

Over the years, a lot of eucalyptus has also been cracked.

However, because of his bad temper, he couldn't get along with his superiors, and he was always the team leader of an ordinary detective team.

Until Zhang Yaoming came to the Dan City Detective Team.

Lan Fengcai became the captain of the detective team.

However, even Zhang Yaoming, Lan Feng ignored him.

Nothing else, he thinks that Zhang Yaoming's ability to handle cases is not as good as his.

However, for Chen Yan, Lan Feng was really convinced.

This is the time to come to Dan City for a few days.

Just two days and one night.

The speed at which the pieces were advancing surprised everyone.

Moreover, the work arranged is well organized, and the analysis of clues and details is in place.

On my own side, just go and execute the order.

This makes Lan Feng very comfortable to work.

However, the eucalyptus pieces are complicated and confusing. It can be said that Lan Feng does not see any correlation among these eucalyptus.

But now what?

Umbrellas, shoes, cobblers...

Three important threads have been linked.

Chen Yan has even simulated the murderer's trick.

And now, Song Pengcheng's autopsy report has also verified Chen Yan's guess.

No wonder they sent people from above.

This is ability.

Except for Lan Feng, everyone else looked at Chen Yan with surprise and admiration.

"Team Chen, what shall we do next?"

At this moment, everyone saw the dawn of breaking the eucalyptus.

Chen Yan shook his head: "The determination of the cause of death can be said to have solved part of the mystery."

"Since Song Pengcheng is paralyzed by electric shock, then the death process of Li Wei, Chen Pingping, and Wu Jianguo is very likely to be the same."

"This explains why the four of them didn't shout or fall to the ground to put out the fire when they spontaneously ignited."

"Because, when these four people ignited spontaneously, they were already paralyzed by electric shock."

Chen Yan did not arrange work, but looked at Qin Yijun: "What is the metal powder in the report?"

"This has been tested, it is aluminum powder and iron powder..."

Aluminum powder and iron powder?

Some metal debris was also found at the scene where Li Wei and others died.

These things, everyone thought they were left behind after the rib of the umbrella was burned.

But why aluminum powder and iron powder?

When metal is melted at high temperature and condensed when it is condensed, debris or beads should be formed...

rather than powder.

While everyone was wondering, good news came from the laboratory.

"Team Chen, Team Zhang, the disassembly of shoes and umbrellas has been completed, and there is a major discovery!"

The detective in charge of this work was excited.

"We found out why the deceased was able to spontaneously combust!"

On the conference table are the dismantled umbrellas and shoes.

"Team Chen, there is indeed something wrong with this shoe."

It turned out that a special device was implanted in the heel of this shoe.

It is a self-made discharge device. "

This thing, although the electricity generated is relatively small, but the instantaneous voltage of this device can be as high as 10,000 volts!

With a voltage of 10,000 volts, once it is touched by the human body, it can be paralyzed and stiff in an instant.

High voltage electric shock, above 36 volts, is dangerous voltage.

Household 220 volt voltage, once electric shock, can not be separated for a short time, it will be life-threatening.

And the voltage of 10,000 volts, if it lasts for a longer time, people can directly fly to ash and die.

"The upper frame of the umbrella is specially made."

"The stuff inside is aluminum powder and some catalytic substances."

Catalytic substances?

Chen Yan stepped forward to check and frowned slightly: "Could it be... the thermite reaction?"

Hearing that the detective in charge of the test said the catalytic substance, Chen Yan immediately remembered what he had learned in high school, the redox of iron.

Although the specific equation and chemical reaction have been forgotten, Chen Yan still has an impression of this term.

No wonder, there were iron powder and aluminum powder on Song Pengcheng's body.

That's what happened.

"Chen team, you are right, it is the thermite reaction."

"The killer was very powerful. He stored the thermite in the umbrella frame and also had built-in electronics."

"We have tested the device and the high-voltage electrical device in the shoe has an induction system."

"Once the rain is detected, and the umbrella and shoes are within a certain distance, the thermite will detonate!"

"And the burning temperature of the thermite can reach more than 3,000 degrees Celsius. At this temperature, the human body is carbonized, which is a matter of a few minutes."

"Moreover, this chemical reaction also has a self-extension effect, that is, once it occurs, the reaction can continue until the end of the reaction by the heat released by its own chemical reaction."

"And rainwater, in this process, can't stop this high-heat chemical reaction, and it will even be decomposed into hydrogen and oxygen by high temperature, which will eventually support combustion..."

The detective in charge of the test gave a chemistry class to the special team.

Although many people do not understand, but in the end everyone understands.

The murderer killed the victim first through the high-voltage device in the shoe, so that he could not struggle or call for help.

After that, the thermite in the umbrella detonated synchronously, and a high temperature of 3,000 degrees Celsius erupted in an instant, burning the body to ashes.

As a result, this kind of effect that seems to be the spontaneous combustion of the human body is formed.

Sure enough, there is no weirdness in the world, it's just that the knowledge is not enough, and it is unexpected.

Although Chen Yan guessed the other party's method, he really didn't know the specific method.

High voltage electricity is physics, thermite reaction is chemistry...

And Chen Yan is not very good at these two points.

"Team Chen, what should we do next?"

Chen Yan looked at Zhang Yaoming who was questioning: "Wait!"

"All we can do now is wait."

"When the Lanfeng team finishes inquiring about two things, I need to confirm some things..."

...

28 at 7 am.

The news came.

Last night, after the meeting, Lan Feng went straight to the scene.

I didn't sleep a night.

Interrogation Outdoors.

Li Fengtian, the office director of Xiyanghong Nursing Home, is being questioned by Lan Feng.

"If the office of President Wu, apart from himself, only I have it."

"I go to the nursing home in advance every morning to clean the office of President Wu."

"You clean yourself?"

"Yeah, I clean it myself..."

"Oh, by the way, some time ago, besides me, there was a young man who was a volunteer in our nursing home. He went to the nursing home earlier and helped me for a few days."

Volunteer, cleaning the dean's office?

Chen Yan said through the microphone in the monitoring room: "Lan Feng, ask him about this volunteer."

Monitor indoors.

"What's the name of this volunteer, how old is this, and is he still in your nursing home?"

Li Fengtian nodded: "This volunteer's name is Dong Lingyun, he is in his 20s..."

"We have always been in our nursing home, but this guy comes three times a week, Monday, Wednesday and Friday, and is usually absent."

Dong Lingyun?

When Lan Feng heard Li Fengtian say the name, his heart suddenly moved.

Telling his colleagues to continue, Lan Feng left first.

Monitoring room next door.

Lan Feng looked solemn: "Chen team, there is an accidental discovery."

...

Projection is on.

"This person, Dong Dejun, is Li Wei's colleague and also works in the funeral home."

"What you asked me to keep track of, regarding the reporting of Li Weilian's living person, progress has been slow these two days."

"Dong Dejun was rather vague about what happened back then, and has not been very cooperative with our work."

"So, we focused on investigating Dong Dejun's personal information..."

"As a result, this Dong Dejun, although he is 54 years old, is not married, but adopted a child ten years ago,"

Adopted a child?

Chen Yan looked at Lan Feng: "This child...is the volunteer Li Fengtian said...Dong Lingyun?"

Lan Feng nodded: "Yes, that child's name is Dong Lingyun, but I'm not sure if it's the Dong Lingyun that Li Fengtian said."

Not sure, check it out!

Thorough investigation.

"Immediately summon Dong Dejun and Dong Lingyun."

Chen Yan finally made the decision: "At the same time, find out the details of Dong Dejun's adoption of Dong Lingyun."

"Who is Dong Lingyun's biological father, why was he adopted back then, where has he been all these years, what job does he do, I want all information on Dong Lingyun."

Lan Feng nodded heavily.

This information is very crucial.

Li Wei, Cheng Pingping and Wu Jianguo have made it clear that there is no connection whatsoever.

However, they were all dead.

Why did the murderer kill three unrelated people?

And it was carefully planned for so long.

So, there must be a reason behind it that people don't know.

And now, Dong Lingyun is the only one who may link Wu Jianguo and Li Wei together.

There is a goal, and checking these basic information is very fast.

Dong Lingyun, formerly known as Wang Lingyun.

Ten years ago, he was adopted by Dong Dejun.

At that time, Dong Lingyun was 14 years old.

As for Dong Lingyun's parents, they died in a car accident when Dong Lingyun was 7 years old.

Later, Dong Lingyun lived with his grandfather Wang Side.

It's just that, if the sky is unpredictable, people will have good luck and bad luck.

When Dong Lingyun was 13 years old, Wang Side got cerebral palsy and could not take care of himself.

And Dong Lingyun couldn't take care of the old man all the time because he had to go to school.

Fortunately, Wang Side had some savings, and Dong Lingyun's biological parents had some compensation after the car accident. Dong Lingyun sent the old man to the nursing home.

However, a year later, the old man was admitted to the hospital because of burns, and finally died.

...

trial room.

Chen Yan is personally interrogating Dong Dejun.

"Dong Dejun, can you tell me why you reported Li Weiwei to a living person back then?"

"What happened back then was a misunderstanding. I have already been punished back then, and those things have long been forgotten..."

forget?

Did you really forget that every time you drink alcohol, you will shout about being wronged?

However, by now, it is no longer a question of whether Dong Dejun says it or not, and whether he cooperates or not.

What happened to old man Wang Side in those days laid the groundwork for everything today.

"Dong Dejun, since we called you here, we know what happened back then."

"Ten years ago, you adopted Dong Lingyun."

"And Dong Lingyun's grandfather, Wang Side, you should know better than anyone else, right?"

At this moment, Dong Dejun suddenly raised his head, his face turned ashen.

Chen Yan saw everything in his eyes, but did not pause in his mouth: "Ten years ago, Wang Side changed to cerebral palsy and was sent to the Sunset Red Nursing Home by 13-year-old Dong Lingyun."

"And the dean of this nursing home is called Wu Jianguo. Are you familiar with this name?"

"Wang Side was in a nursing home. Due to the poor care of the nursing staff, the electric blanket on the bed caught fire and caused extensive burns."

"Then, he was sent to the burn department of the First Hospital by the nursing home, and he passed away not long after."

"I checked the records of that year. The burn department, the nurse in charge of nursing Wang Side, is called Chen Pingping..."

"You are familiar with this name."

"That night, Wang Side's body was sent to the funeral home."

"You were on duty with Li Wei that day. According to the procedure, you are responsible for checking Wang Side's death certificate and changing the old man's clothes."

"However, when Li Wei was drinking at the time, he directly pushed the old man into the crematorium..."

"Dong Dejun, am I right?"

Dong Dejun, let out a long breath at this moment.

"What happened back then, I am very sure, Wang Side really didn't die!"

Dong Dejun explained everything.

"Back then, Chen Pingping went home temporarily to pick up the child to the First Hospital because his son had a fever."

"However, she forgot to change the oxygen cylinder for Wang Side."

"When she came back, Wang Side must have passed out due to lack of oxygen."

"And Chen Pingping, who was afraid of taking responsibility at the time, did not check carefully, and directly reported Wang Side's death..."

"Then the body was brought to the funeral home."

"However, when I checked, the old man had recovered somewhat, and he could move his fingers..."

"He's definitely not dead, but Li Wei didn't listen. He drank too much and pushed the person directly into the crematorium..."

...

According to Dong Dejun's account of what happened in that year, although he made a report, the person has been cremated and there is no evidence.

Where is the death certificate, how could it be possible to judge Li Weilian as a living person just by Dong Dejun's words?

What's more, it still involves the doctors, nurses of the First Hospital, and people from the funeral home.

So, this matter is over.

However, everyone thought it was impossible, but Dong Lingyun believed Dong Dejun's words.

14-year-old Dong Lingyun is already sensible.

Dong Lingyun, who originally depended on his grandfather and was reluctant to part, was obviously more willing to believe what Dong Dejun said.

What's more, these years, as long as Dong Dejun is drunk, he will definitely talk about it.

It is conceivable that in Dong Lingyun's heart, he must feel that the people from the Sunset Red Nursing Home, the First Hospital, and the Funeral Home killed his grandfather.

Moreover, it is an indisputable fact that Wang Side was burned because of a mistake in the Sunset Red Nursing Home.

However, the nurse at the time died of a heart attack 7 years ago.

Dong Lingyun wanted revenge, but it was impossible.

However, Wu Jianguo is still alive.

As the director of the Sunset Red Nursing Home, Dong Lingyun naturally set his sights on him for revenge.

Another interrogation room.

Facing Chen Yan, Dong Lingyun was very calm.

"Since you can find me, you should already know what happened back then?"

Chen Yan nodded.

Not only that, Lan Feng immediately organized detectives to search the residences of Dong Dejun and Dong Lingyun.

When Chen Yan saw what Lan Feng brought back, he was stunned.

ten years!

A full ten years.

Dong Lingyun has been planning all this since he was adopted by Dong Dejun.

When he was in school, Dong Lingyun would stop by Li Wei, Chen Pingping or Wu Jianguo every time after school.

Later, when Dong Lingyun grew up, he began to plan this action.

The bicycle for shoe repair, the material for making thermite, and the high-voltage discharge device were all found in Dong Lingyun's house.

Chen Yan nodded.

With these, in fact, Dong Lingyun has been convicted.

However, Chen Yan still wanted to see this person.

"does it worth?"

Ha ha.

Ha ha!

Dong Lingyun laughed: "Do you think it's worth it?"

The expression on his face is like a ghost!

"My grandfather, there was still help!"

"However, they were burned alive!"

"You said, should they die?"

"So, you want to end their lives by spontaneous combustion?"

"That's right, if it wasn't for the success of the experiment, I would have killed them long ago..."

"I want them to have a taste, what does it feel like to be burned to death?"

Chen Yan left.

He didn't ask Dong Lingyun what he would do if Dong Dejun got it wrong.

What if Wang Side really died back then and everything was a misjudgment by Dong Dejun.

Because it is not necessary.

It is true that there are problems in the nursing home managed by Wu Jianguo Chen Pingping's poor nursing in those days caused the elderly to suffer from hypoxia.

Li Wei... It was also true that he took up the post that day after drinking.

Just like back then, everyone thought that Wang Side was dead.

However, Dong Dejun did not believe it.

Dong Lingyun didn't believe it either.

This is enough.

Behind any hateful death, there is a tragedy.

In an avalanche, no snowflake is innocent.

...

－－－－－－off topic－－－－－

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