"Some people may think that the base of the Western chess piece is very stable, and the key will be pulled out of the notebook by the chess piece before it is pulled down by the tape, but as long as the chess piece is turned over and placed with the round end as the bottom, it is easy to press the key under the notebook. Conan explained, looking triumphantly at the stars, as if to speak of his victory.

After arranging everything in the study, Conan walked out of the house and closed the door, then used his mobile phone to dial the landline in the study.

When the answering machine is activated, the tape begins to roll back, and with this force, the chess pieces will be pulled down, and the key to the door will be pressed right under the notebook.

In the book room, when everyone's attention was focused on the shortening audio tapes, Xingchen came to Bai Cang's side again and tempted him: "Uncle, this is your last chance, how about it? Can you give me all the USB flash drives you took?"

A drop of sweat fell from Bai Cang's forehead due to nervousness, but he didn't bother to wipe it. Since this secret room was arranged by himself, Bai Cang knew that he only had this few tens of seconds to make a decision.

Anyway, it's a death, fight!

"Okay! I promise you!" Bai Cang could only pin his last hope on the little child in front of him.

There was a "click", and sure enough, as Conan expected, the tape strap was pulled behind the Western chess piece, and the key was pressed right under the notebook.

After another ten seconds, after the tape was fully loaded into the answering machine, Conan pushed open the door and asked Dr. Asasa who had witnessed the whole process in the room, "How was it?

"It's perfect!" Dr. Asa gave Conan a thumbs up, complimenting him on his reasoning.

"In this way, the only person who can complete this technique is Mr. Shirakura who left ten messages!" Officer Henggou finally figured it out, he looked at Shirakura and said, "The murderer is you!"

"Wait!" Bai Cang defended, "It does seem to be a very powerful trick just now, but it doesn't necessarily mean that I did it? Besides, if I'm the murderer, why would I go out of my way back to the scene of the murder?"

"It's because you have to retrieve the tape covered in your fingerprints!" Conan usually reasoned in front of the murderer only if he had conclusive evidence.

"When I saw the fingerprints on the tape, I knew it was an unpremeditated, impulsive crime. Conan first characterized Hakura's murder, and the legal discretion for premeditated murder and impulsive murder was completely different, which was a small technique to break down the prisoner's sense of resistance, just like the slogan "Confess and be lenient".

But in fact, the consequences of leniency are often to sit in prison.

If Bai Cang chooses to surrender as soon as possible after the killing, then he can still win a lenient sentence. But the moment he decorated the room into a secret room, impulsive murder became a vicious crime.

"Tonight you may have met Professor Hirota, the two of them had an argument and unknowingly killed him, thanks to the fact that you were in a hurry to come up with the secret room, but since you were not premeditated murder, you didn't wear gloves. ”

"I'm guessing you originally planned to become the discoverer of Professor Hirota's body yourself, and then dispose of the tape that possessed your fingerprints after Mrs. Hirota confirmed the secret room, but you didn't expect Dr. Asa to find out about Professor Hirota's death before you, so you had to follow the phone message and come here. ”

Conan guessed the entire murder process of Bai Cang, and ordinary people often confessed to their guilt at this point, but Bai Cang made a deal with Xingchen, and he still stubbornly said: "I don't understand what you're talking about!"

"Huh?" Hakura's reaction greatly surprised Conan.

Faced with the iron-clad facts of the crime, Officer Yokogou couldn't figure out why Bai Cang continued to resist.

It wasn't until the stalwart officers re-examined the tapes in the evidence bag that they found that there were no of Conan's alleged fingerprints on them.

"When you closed the door and demonstrated the secret room technique outside, Xingchen had already disposed of the fingerprints on the tape. Gray Yuan walked over to Conan and whispered, she was the only person in the room who noticed that Xingchen was destroying the evidence for Shirakura.

Xingchen did this but was not caught red-handed, so there is no way to take him now, Conan can only say angrily to Gray Yuan: "Why don't you stop him?"

"I'm just curious about the methods of the secret room, and I'm not obligated to catch criminals for you. Great Detective!" Gray Hara said with a smile.

The woman who came out of the black-clothed organization is really unreliable!

"I'm so sleepy!" When the case reached a deadlock again, Xingchen suddenly spoke: "Officer Henggou, we still have to go to school and work tomorrow! Let's go home first!"

Officer Henggou thought about it, the work of sampling physical evidence at the scene had been completed, and there was no point in continuing to stay here, so he had to order the team to be closed temporarily.

After making the record, everyone left their contact information and went home, waiting for the police to summon them at any time, Xingchen said to everyone intentionally or unintentionally when he left Professor Hirota's house: "Actually, there is no big problem with Conan's reasoning method, but if I am a murderer, I will not be stupid enough to make ten phone calls! I will only make one phone call, and then pretend to forget to hang up, so as not to arouse the suspicion of the police." ”

I don't know if this was said to Officer Yokogou, or to the murderer Shirakura, or specifically to Conan. But none of that matters anymore.

When Xingchen appeared in a nearby parking lot with Dr. Asasa, Conan, and Gray Hara, Xingchen took out a car key from his pocket and pressed the button on a blue Mazda, the lights flashed twice and the door opened automatically.

"You made a deal with Shirakura?" Conan realized that Xingchen deliberately cleared Shirakura of charges in order to get back the USB flash drive before the police.

"You're still too rigid about the rules. If the normal process is followed, after Bai Cang is arrested, these USB flash drives will be taken away by the police as physical evidence. Xingchen easily found the USB flash drive that was taken by Bai Cang on the dashboard in the front row of the car.

"But after the police confirm these USB flash drives, they will also return them to us!" Conan said without confidence.

When I get the USB flash drive back from the police again, I don't know how long it will take in the middle, and I don't know how many people will come into contact, if the black-clothed organization does not take this opportunity to drop the bag, then it is not worthy of becoming a transnational and cross-century criminal force.