Chapter 169

When Bai yanzhenyu and ash yuanai returned to the screening hall, the Mumu police department and others had completed the investigation and were ready to characterize Zhang tianzhengci's death as a suicide caused by unable to bear the pressure of debt.

"Bu Mei, Yuantai, Guangyan, give you a task, wait..."

Baiyan Zhenyu quietly shouted to the Bumei trio, arranged a task for them, and rushed to the projection room on the second floor.

After arriving at the screening room, Bai yanzhenyu put the video tape from the police into the projector, and then took down two large broken lenses from the wall of the lounge.

Then, Bai yanzhenyu placed one of the lenses in front of the left projector and adjusted it to a refraction angle of 45 °, while the other lens was placed in front of the window of the right projector at a parallel angle to ensure that the light emitted by the left projector can be played out from the window of the right projector after the refraction of the two lenses.

After getting ready, Bai yanzhenyu instructed Conan to turn off the lights in the screening hall by telephone, and the screening hall suddenly darkened.

Just when the Mumu police department and others did not know why, the figure of Baiyan Zhenyu appeared at the observation window of the projection room.

Mumu police department looked up at the smiling Baiyan Zhenyu and asked suspiciously, "brother Zhenyu, what are you doing in the screening room?"

Baiyan Zhenyu's eyes swept from curator muratsu and others, smiled and replied, "do you want to ask? Of course, it's a repeat of the criminal's modus operandi."

"What?" hearing Bai Yan Zhenyu say so, Mumu police department immediately exclaimed, "you found the evidence of the murder? Then who is the murderer?"

"Of course," Bai yanzhenyu nodded, stretched out his hand and pointed to Guqiao Ren, who looked as usual, and said in a deep voice, "in a dark screening hall, the murderer who killed Mr. Zhang Tian is Mr. Guqiao who used the projector to make an alibi for himself!"

"Don't talk nonsense, little brother."

Before Guqiao Ren retorted, Youli baibailizi directly questioned Bai Yan Zhenyu: "when the shadow appeared on the big screen, Mr. Guqiao clearly stayed in the screening room with me."

"At that time, you two were indeed in the projection room, but Mr. Zhang Tian was killed in advance and hung there. As long as you use some props, you can control the timing of the emergence of the shadow. If you don't believe it, you'll be optimistic."

After Bai yanzhenyu said that, he turned on the projector to play. When amela came out, he removed the first mirror placed in advance. Suddenly, a dark shadow appeared on the big screen.

Mu Mu and others took a closer look and found that Yuantai didn't know when she climbed the ladder and was grasping the rope and hanging in front of the projection window.

Youli bailizi seemed relieved and disdained to say, "please, what kind of criminal technique is this? It's just a child hanging in front of the window."

"It's not."

Bu Mei and Guangyan, who were arranged by Bai Yan Zhenyu, retorted: "Mrs. yuan has been hanging here since the beginning, but you didn't find it."

Mitsuko Inoue pushed the glasses on the bridge of his nose and scolded discontentedly, "you two children don't lie. If he had been there at the beginning, we should have found him when we looked at the window just now."

"They didn't lie. The reason why you didn't find it just now is that I blocked the window with books and completely blocked the light in the projection room. In this way, even if you hang the body there in advance, it's difficult for you to find it."

Baiyan Zhenyu explained while blocking the window with a book. Yuantai hanging there immediately hid into the dark.

Officer Mu agreed with this technique and then asked, "brother Zhenyu, according to everyone's confession, the body was shaking at that time. If the body was prepared in advance, why did the body shake?"

"Hehe, well, Yuantai, Guangyan and Bumei, it's up to you." Bai Yan Zhenyu smiled and motioned Bumei to act according to the plan.

"OK."

Bu Mei promised. Then Guangyan and bu Mei jumped up and hugged Yuantai. They hung on the rope together.

"Holding three children together is about equal to the weight of an adult male. Next, ash yuan, it's your turn."

Shii Masawa, as like as two peas in the air-conditioned accommodation room, Haibara Ai, re opened the air conditioner in the showroom, and the three children hanging in mid air were swaying by the wind, just as the case at the time of the dead.

Looking at the surprised people, Bai yanzhenyu patiently explained: "at that time, the screening hall was a sealed space. As long as the wind direction and intensity of the air conditioner were adjusted in advance, the wind of the air conditioner could be used to make the body shake a little. At the time of the crime, the wind force of the air conditioner suddenly became stronger than usual, right, curator muratsu."

Curator muratsu nodded and confirmed, "yes, the wind and temperature are abnormal."

"Sir, even if you know the reason for the shaking of the body, you seem to have forgotten the most important point..."

Gu qiaoren, who was accused of being the murderer, sighed and asked, "it was the window these children were hanging at that time. If it was hung there at the beginning, there would be a dark shadow. If books were used to block the light in the projection room, there would be no way to show movies. How did I show movies before that?"

"As long as you use the mirror in the lounge to adjust the angle of the lens, you can reflect the image, and then use the other mirror in the observation window to reflect, you can avoid the playback window where the body is located and broadcast it from the observation window."

Baiyan Zhenyu blocked the window with a book, then adjusted the previously removed lens back to its original position, and the picture reappeared on the dark big screen.

"In this way, even if you don't cut off the video tape, you can use a projector to change the window for showing the film. It is this technique that makes miss baihezi talk to you from the door without seeing the abnormality here."

"I think your plan is probably like this. First show the film in this way. When Miss Lily helps you go shopping, first run to the air conditioning room to change the intensity and wind direction of the wind, then enter the auditorium, strangle Mr. Zhang Tian with a rope prepared in advance, and finally hang his body there."

"Then, you just go back to the screening room, wait for Miss Lily to buy something, take the book away from the window to be screened, and secretly remove the lens. In this way, the dark shadow of the shaking of the body will appear on the screen, and you will have an alibi."

"Finally, the people found the body in a commotion. You and Miss Lily came to check the situation, but you deliberately lagged behind and glued the mirror fragments out of the wall."

"As for the evidence, the focus of the film was wrong, resulting in a slight blur of the image."

"By the way, your use of mirror fragments led Miss Lily to go to the washstand in the bathroom to adjust her contact lenses. That's why I can think of this technique."

The criminal technique was completely cracked by Baiyan Zhenyu. Guqiaoren naturally could not refute it. Finally, he withdrew and admitted his criminal behavior and was brought back to the police station by Mumu police department.