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Tuesday, January 5th, at night, Hirota Masami family. "Talk*Follow*

Hirota Toshiko went to call, and a police officer came over and reported: "Henggou Police Department, a young man named Shirakura Yang came outside."

"Let him come in." said the Yokogami police department. "If anyone named Hiroya, Hiroshi and Domomorioka, let them in."

After Shirakura Yang came in, he was shocked to find out that Professor Hirota had been killed.

Not long after, Hoshiya, Hiroshima and Domoto Morioka also came, and they were also shocked when they learned that Professor Hirota was killed.

"Mr. Shirakura, Mr. Morioka, what's going on with this phone recording?" The Henggou police department played the phone recording again.

"I'm Morioka. I'll arrive at 6pm this afternoon, set up the chessboard and wait for me. Four and fifty-onepm."

"Professor, I am Shirakura, please reply to my phone as soon as possible." After a period of time, "at 5:31 pm."

"I'm Morioka. Since you're not here, I'll go back. Really, I didn't say anything early after drinking too much. It was 6:00 and 3:00 in the afternoon."

"I'm Shirakura, because I'll have something to do from tomorrow. I'll go to your place from here. It's 6:07 pm."

The Henggou Police Department asked: "Mr. Shirakura, the first call was interrupted for nearly a minute. Why is that?"

"Oh, I just forgot to hang up the phone." Shirakura Yang said.

"That's it." said the Henggou Police Department, "So, has Professor Hirota replied to your phone?"

"No, I'm just here to try my luck," said Shirakura Yang. "I'm working as a model now. This time I'm going to do a project for the magazine. I suddenly remembered a photo I took with Professor Hirota in college, so I came over to borrow the floppy disk with the photo from the teacher. Even if the professor is not here, as long as the wife is there, it's OK."

"Floppy disk?" asked the Henggou police department.

"My husband has the habit of saving things to a floppy disk." Hiroda Toshiko said, "I like photos, university entrance exam questions, student transcripts, and even his chess and winning records of Mr. Morioka playing chess."

"So that's it." Henggou Police Department asked, "What about this floppy disk?" As he said that, he went to the computer desk to look at it, and found that there was no floppy disk. Then he opened various drawers and looked at it, but he also found no floppy disk.

"It seems that this is the motive for the murder." The police department of Yokogo said, and then asked Hirota Toshiko, "How many floppy disks are there?"

"This," said Hirota Tokiko, "I don't know the specifics. There are many, and there must be more than one hundred."

The Yokogami police department asked the forensic personnel to check the computer, and then asked Domo Morioka, "From the phone recording, have you been here?"

"Yes," said Doof Morio Morioka, "it was about six o'clock when I came. The door of the entrance was not locked. I rang the door bell but no one answered. I thought he might have been taking a nap because he was drinking too much, so he came into the room by himself, but when I came to knock on the door of the study, no one answered. The door of the study was locked again. I thought the professor slept very heavily because of the noon wine, so he went back."

"How do you know about Professor Hirota drinking at noon?" asked the Henggou Police Department.

"I was going to participate, but there was something to do at the moment," said Dojo Morioka.

The police department of Henggou asked, "Mr. Hoshiya, why did you come?"

Hoshiya Kazuhiro said: "My daughter recently decided to apply for Nanyang University, so I came to ask the teacher to write a recommendation letter. Unexpectedly, the teacher seemed to have drunk a lot of wine, so I left a floppy disk and went back, which contained my daughter's information."

The Henggou Police Department said: "Mr. Hoshiya, your daughter wants to apply for Nanyang University. If you have a floppy disk for the entrance examination questions, it will be no problem to pass the exam."

"No, no, it's not like this. I have never thought about this kind of thing." Hoshiya and Hiroshi said.

The Henggou Police Department asked, "So, when did you leave?"

"I stayed here for five minutes, no, ten minutes, up to fifteen minutes." Hoshiya Kazuhiro said.

"So, where will you go in the future? Is there any absent certificate?" asked the Henggou Police Department.

"Absent proof?" Hoshiya and Hiroshi asked, "Is the receipt from my parking lot OK?" He said and took out the parking receipt.

The Henggou Police Department looked at it, "The time for this receipt is around 4:22. How far is the parking lot from here?"

"It's a few minutes away." Hoshiya Kazuhiro said.

"There is still a great suspicion." said the Henggou Police Department.

"Police officer, you can't do this. Don't forget that besides us, there may be others who have come." Hoshiya and Hiroshi said.

"Yes, officer," asked Doveho Morioka, "I have something to do tomorrow morning, can I go back?"

"Mr. Morioka, you can't go back. You said you were here just now, but in fact there is no fingerprint on the doorbell." Yokogo Police Department said, "So please wait a little longer."

"What, what!" Dojo Morioka was shocked.

"How is it?" Haibara Ai asked Conan in a low voice, "Have you figured it out? This murder in the secret room?"

"I already know who the murderer is, but I almost didn't understand the technique." Conan whispered, "Put three pieces to hold up the hard shell notebook, and then bounce the key through the crack of the door, bounce a piece open like a bowling ball, so that the notebook can fall, but this only works in theory, and the force is difficult to grasp accurately. If it is heavy, the key will rush out of the notebook, and the phone will not make sense."

"You already know who the murderer is?" Haibara Ai was shocked.

"What's so surprising about this?" Conan said.

At this time, the forensics reported that there were no fingerprints on the computer, no travel photos, admission test questions, chess and other things, which should have been deleted. If you want to recover the data, you can take them back and try it.

"Yes." said the Henggou Police Department, "The tape for the phone recording is not needed. You can take it back too to see if you can find out what the background sound is when they call."

The forensic staff turned on the phone and took out the tape. Conan accidentally found that the tape of the tape was full of wrinkles. He thought to himself, this was... and then he laughed.

Conan pulled the corner of Dr. Agasa's clothes and took him to the side, "I already understand. You can ask the police to prepare a box of the same straps first, and then cooperate with me."

"Okay, no problem." Dr. Agasa smiled, and then went to negotiate with the Henggou Police Department.

"Did you really figure it out?" asked Ai Haibara.

"Yes, just wait and see, the truth about the murder in this secret room." Conan said with a confident smile.

Not long after, the tape was sent, and Dr. Agasa gave it to Conan, "Do as I just said."

"Yes, Doctor," Conan said, and then while Dr. Agasa was blocked, he used a bow tie voice changer to use Dr. Agasa's voice, "This room is indeed a perfect secret room, but if you use the tapes in the phone recorder and three chess pieces, you can open this secret room."

"Is this true for audio tapes and chess pieces?" Henggou Police Department asked happily.

"Of course, facts are better than words," said Dr. Agasa.

Conan borrowed mobile phones and gloves, and then arranged them while manually setting them up, saying, "First pull the tape inside the tape out of the appropriate length, and then put the tape into the phone. Of course, the tape is still exposed. Then straighten the exposed tape, walk out of the door, then pass the tape through the ring on the key, then leave the key outside the door, hold the remaining tape back to the position where the notebook fell in the room, then arrange three pieces of chess with the same height into a triangle, use the front end of the tape to cover the piece closest to the phone, and then put the notebook on it."

"It's totally nonsense. You have to use the power of tightening the belt to pull the key, let the key knock the chess piece down, and let the key get off the belt." Haibara Ai said, "But the base of the chess piece is very stable. With the key touching the force of the chess piece, the key cannot knock the chess piece over the chess piece at once, but will be pulled outside the notebook with the chess piece."

"What if it's reversed?" Conan smiled, "The next step is to turn the chess piece upside down. Although the top of the chess piece is round, it should be able to support it if it's a solid hard-shell notebook."

Conan set up the scene, then went out to bring it to the door, and used the mobile phone to call the landline in the room. "Then the phone answering recorder turned on and rolled the belt. This force made the key pass through the gap under the door, enter under the notebook placed in front of the telephone in the house, hit the chess piece, causing the chess piece to lose balance, and the key stayed under the notebook. If the telephone recorder continues to turn on, it will completely roll back the belt, and the evidence will disappear." Then he went back to the room and asked, "How is it going, is it going?"

"You can see it yourself." Haibara smiled, "The reversed chess piece can't hold the strap at all. You can't forget the pulling force that the reversed chess piece can withstand. Before the key reaches the notebook, the strap pulls the chess piece down."

Seeing the key stuck behind the hard-shell notebook, Conan was shocked, "How could this happen?"

"Dr. Agasa, is this your theory?" asked the Henggou Police Department.

"This..." Dr. Agasa's sweat came down.

"Leave it to me," Haibara said with a smirk. "Actually, it's very simple. Children can play with it. Just push the key in and let the notebook fall off."

"Simple?" The Henggou police department sweated.

"Of course." Haibara Ai put the key on the ground, pushed it with his hand a few times, tried the sliding distance between the force and the key, and then used the reverse three chess pieces to hold the notebook in front of the phone, and then pulled out a belt that was long enough, but the belt did not bypass the key, and the top of the belt was covered with chess pieces at the corners.

"You are..." asked the Henggou Police Department.

Haibara Ai went out to close the door, "Look." As he said that, he pushed the key into the crack of the door, then pulled the belt, then opened the door and went in. Seeing that there was only a notebook, he immediately laughed, "How is it? Let the key slide two meters straight on the ground. This is not difficult at all. As long as the power is not too great, the notebook that fell off because one of the pieces pulled away by the belt can press the key so that it will not run out."

"What if it's not successful?" asked the Henggou Police Department.

"Isn't there a telephone that is locked underground behind it? If the power is high, the key will rush through the notebook and it will rush under the phone, and it will get stuck below it." Haibara Ai said, "and there are even simpler."

"It's easier?" asked the Henggou Police Department.

"If you can pass the key in this door, you will definitely pass the wire," said Ai Haibara. "And if you have two meters, the length of the telescopic tape measure is two meters. You can use the key to push it without pulling the tape."

"No, good, it's really simple." Henggou Police Department said happily, and then said, "The murderer is you, Mr. Shirakura Yang, after you implemented this technique, you lay on the door and called, watching the strap retract into the answering machine, and then hung up the phone, so there was a blank in your message for nearly a minute."

"I said it, I just forgot to hang up the phone." Shirakangyang asked, "Why did I know that the technique just now was done by me? Besides, if I were the murderer, why would I run back to the scene specifically?"

"Ah? This..." Henggou Police Department looked at Dr. Agasa.

Dr. Agasa quickly waved behind him, signaling Conan not to chat with Ai Haibara and quickly take over.

Ai Haibara walked back to Dr. Agasa and laughed at Conan behind him and said, "How is it? I know who the murderer is now."

Conan muttered: "I thought of using tapes from the tapes and making chess pieces in reverse, and they can only be considered a draw."

"Okay, okay," Haibara Ai laughed in a low voice, "I am the sister and let you, the little brother."

"After that being so old are you?" Conan asked in a low voice.

"Secret." Haibara said with a smirk.

"Damn it." Conan complained, then saw Dr. Agasa waved behind him, and immediately used his voice-changing bow tie to use Dr. Agasa's voice, "The murderer is Mr. Shirakura Yang. After he killed Professor Hirota, he found something from this house to clean up the evidence and arrange the scene, but he did not prove it, so he wanted to alleviate the suspicion on himself and create a suspect."

"Made?" asked the Henggou Police Department, "How to make this?"...
Chapter completed!