Chapter 637: The girl in the decryption room

　　 Tuesday, January 5th, in the evening, at Masami Hirota’s house.
　　 Hirota Toshiko went to call, and a police officer came to report: "Henggou Police Department, there is a young man named Bai Cangyang outside."
　　 "Let him in." Yokozo Police Department said, "If there are people named Hosiya and Hiroshi and Morioka Doo, let them in too."
　　 After Bai Cangyang came in, he was surprised to learn that Professor Hirota had been killed.
　　 Soon after, Hosiya Kazuhiro and Morioka also came, and they were shocked to learn that Professor Hirota had been killed.
　　 "Mr. Shirakura, Mr. Morioka, what's the matter with this telephone recording?" Henggou Police Department played the telephone recording again.
　　 "I'm Morioka, I can be there at 6 o'clock this afternoon, set up the board and wait for me. 4:51 pm."
　　 "Professor, I am Bai Cang, please call me back as soon as possible." After a period of time, "5:31 PM."
　　 "This is Morioka. Since you are not here, I will go back. Really, I don't even say a word if I drink too much. At 6:03 in the afternoon."
　　 "I am Shirakura, because I will have something to do from tomorrow, so I'll go from here to your place. It's 6:07 in the afternoon."
　　 Henggou Police Department asked: "Mr. Baicang, the first call was disconnected for nearly a minute, why is this?"
　　 "Oh, I just forgot to hang up the phone." Bai Cangyang said.
　　 "That's it," Henggou Police Department said, "So, did Professor Hirota call you back?"
"No, I just came here to try my luck." Bai Cangyang said, "I am now working as a model. This time the magazine is going to be a project. I suddenly remembered a photo I took with Professor Hirota in college. The one who borrowed the floppy disk with the photo from the teacher, even if the professor is not there, as long as the wife is there."
　　 "Floppy disk?" Henggou Police Department asked.
"My husband has the habit of saving things to a floppy disk." Hirota said, "Favorite photos, university entrance exam questions, student transcripts, and even the history and winning record of his and Mr. Morioka's chess Save it in."
　　 "So that's the case." The Henggou police department asked, "What about this floppy disk?" He went to the computer desk and looked at it and found that there was no floppy disk. Then he opened the drawers and looked at it. Also no floppy disk was found.
　　 "It seems that this was the motive for the murder." Henggou Police Department said, and then asked Hirota Tochiko, "How many floppy disks were there?"
　　 "This," Hirota Tochiko said, "I don't know the specifics. There are many, surely more than a hundred."
　　Henggou Police Department asked forensic officers to check the computer, and then asked Morioka Dofu, "Judging from the telephone recording, have you been here?"
"Yes," Morioka said, "I came at about six o'clock in the evening, and the entrance door was not locked. I rang the doorbell and no one answered. I thought he might be taking a nap after drinking too much, so he went in by himself. I came here, but I knocked on the study door and no one answered. The study door was locked again. I thought the professor slept very heavily because of the lunch meal, so he went back."
　　 "Professor Hirota drank at noon, how did you know this?" Henggou Police Department asked.
　　 "I was going to participate too, but something will happen temporarily." Morioka said.
　　 Henggou Police Department asked, "Mr. Hosiya, why did you come here?"
Hosiya and Hiroshi said: "My daughter recently decided to apply for Nanyang University, so I came to ask the teacher to write a recommendation letter. I didn't expect that the teacher seemed to drink a lot of alcohol, so I left a floppy disk and went home. data of."
　　 Henggou Police Department said: "Mr. Hosiya, your daughter wants to apply for Nanyang University, so if you have a floppy disk with entrance exam questions, it will not be a problem to pass the exam."
　　 "No, no, it's not like that, I never thought about this kind of thing," Hosiya Kazuhiro said.
　　 Henggou Police Department asked: "So, when did you leave?"
　　 "I stayed here for five minutes, no, ten minutes, fifteen minutes at most," Hosiya Kazuhiro said.
　　 "Then, where will you go next? Is there an alibi?" Henggou Police Department asked.
　　 "Alibi?" Hosoya Kazuhiro asked, "Can I get the receipt from the parking lot?" Then he took out the parking receipt.
　　 Henggou Police Department looked at it, "The time of this receipt is about 4:22, how far is the parking lot from here?"
　　 "A few minutes away," Hosiya Kazuhiro said.
　　 "There is still a lot of suspicion," Henggou Police Department said.
　　 "Police officer, you can't do this, don't forget, besides the few of us, there may be others who have been here," Hosiya Kazuhiro said.
　　 "Yes, police officer," Morioka asked, "I have something to do tomorrow morning, can I go back?"
　　 "Mr. Morioka, you can't go back. You said that you were here before, but in fact there is no fingerprint on the doorbell." Henggou Police Department said, "So please wait a second."
　　 "What, what!" Morioka was taken aback.
　　 "How is it?" Aihara Ai whispered to Conan, "Did you figure it out? This secret room murder?"
"I already know who the murderer is, but the technique is almost impossible to understand." Conan whispered, "Put up the hard shell notebook with three chess pieces, and then pop the key in from the crack of the door, just like a bowling ball. Open a chess piece so that the notebook can fall, but this only works in theory. It is difficult to grasp the strength accurately. If it is heavy, the key will rush out of the notebook and the phone will not work."
　　 "Do you already know who the murderer is?" Huihara was surprised.
　　 "What's so surprising about this," Conan said.
At this time, the forensic staff reported that there were no fingerprints on the computer, no travel photos, entrance examination questions, chess history, etc., and it should have been deleted. If you want to restore the data, you can take it back for a trial. test.
　　 "Yes." Henggou Police Department said, "The tape used to record the phone call is no longer needed. Take it back and see if you can find out what the background sound is when they call."
　　The forensic officer turned on the answering machine and took out the tape. Conan accidentally found that the tape was all wrinkled. He thought to himself that this was... and then laughed.
　　 Conan pulled the corner of Dr. Ari's clothes and took him aside, "I already understand, you first let the police prepare a box of the same belt, and then cooperate with me."
　　 "Okay, no problem." Dr. Aka smiled, and then went to negotiate with the Henggou Police Department.
　　 "Do you really want to understand?" Huihara asked sadly.
　　 "Yes, just wait and see, the truth about the murder in this secret room." Conan smiled confidently.
　　 Soon after, the tape was sent, and Dr. Aka handed it to Conan, "You do it again as I just said."
"Yes, Doctor." Conan said, and while Dr. Aka was in front of him, he used Dr. Aka's voice with a bowtie voice changer and said, "This room is indeed a perfect secret room, but if you use the tape in the telephone recorder and Three chess pieces can open this secret room."
　　 "A tape and chess piece, is this true?" Henggou Police Department asked happily.
　　 "Of course, facts speak louder than words." Dr. Aka said.
Conan borrowed a mobile phone and gloves, then lay out his hands, and said: "First, pull out the tape inside the tape to an appropriate length, and then put the tape into the phone. Of course, the tape is still exposed. Then he exposed it. Straighten the strap outside, walk out the door, then pass the strap through the ring on the key, and then leave the key outside the door, hold the remaining strap and return to the place where the notebook fell in the room, and then put the same height The three chess pieces are placed in a triangle shape. Use the front end of the belt to wrap the chess piece closest to the phone, and put a notebook on it."
"It's a complete nonsense. You have to use the power of the strap to pull the key, let the key knock the chess piece down, and let the key come down from the belt by the way." Huihara said, "but the base of the chess piece is very stable. With the force of the key hitting the chess piece, the key cannot knock the chess piece over at once, but will be pulled out of the notebook together with the chess piece."
　　 "What if it's the reverse?" 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 with a strong hard-shell notebook like this."
Conan arranged the scene, then went out to bring the door, and used the mobile phone to call the fixed phone in the room. "Then the answering machine was turned on and the tape was rolled. This force made the key pass through the gap under the door and enter the phone placed in the house. Under the previous notebook, I hit the chess piece and the chess piece loses its balance. The key is left under the notebook. If the telephone recorder continues to operate, the tape will be completely rolled back and the evidence will disappear." Then he returned to the room and asked, " How's it going?"
"Look at it for yourself." Huihara sneered. "The inverted can't catch the belt at all. You don't even account for the pulling force that the inverted can withstand. Before the key reaches the bottom of the notebook, the belt is The chess piece fell down."
　　 Seeing the key stuck behind the hard-shell notebook, Conan was taken aback, "How could this be?"
　　 "Dr. Aka, is this your theory?" Henggou Police Department asked.
　　 "This..." Dr. Aka's sweat came down.
　　 "Leave it to me," Huihara sneered. "Actually, it's very simple. Children can play it. Just push the key in and let the notebook fall."
　　 "Simple?" Henggou Police Department's sweat came down.
"Of course." Hui Yuanai put the key on the ground, pushed it a few times, tried the sliding distance of the test force and the key, and then put the notebook in front of the phone with three reversed chess pieces. Also pull out a long enough strap, but the strap does not go around the key, and the top of the strap covers the corner pieces.
　　 "You are..." Henggou Police Department asked.
Hui Yuanwei went out and closed the door, "I see." As he said, he pushed the key in through the crack of the door, then pulled the strap, then opened the door and went in. Seeing that there was only a notebook, he immediately laughed, "How about it, let the key? It’s not difficult to keep sliding on the ground in a straight line for two meters. As long as the force is not too great, the notebook that falls due to one less chess piece being pulled by the belt can hold down the key so that it will not run out."
　　 "What if it fails?" Henggou Police Department asked.
"Isn't there a phone behind it that is buckled underground? If the power is strong, the key will rush through the notebook, it will rush under the phone, and then it will be stuck underneath." Huiyuan said sadly. "And there are simpler ones."
　　 "Easier?" Henggou Police Department asked.
"You can pass the key at this door, and the wire will definitely pass," said Hui Yuanwai. "And if it is two meters, there is a telescopic tape measure that is two meters long. You can use that key to push it in without pulling the tape. "
"Yes, yes, it's really very simple." Henggou Police Department said happily, and then said, "The murderer is you, Mr. Bai Cangyang~EbookFREE.me~ You lie on the door after implementing this technique. When making a call, I kept looking at the tape in the tape recorder and then hung up the phone, so there was a gap of nearly a minute in your message."
　　 "I said, I just forgot to hang up." Bai Cangyang asked, "Why did I think I did that trick? Besides, if I were a murderer, why would I come back to the scene?"
　　 "Huh? This..." Henggou Police Department looked at Dr. Aka.
　　 Dr. Aka quickly waved behind him, beckoning Conan not to chat with Hui Yuanai, and hurry up.
　　 Aihara walked back to Dr. Ari, and smiled at Conan behind him, "How is it? I know who the murderer is now."
　　 Conan murmured: "Using the tape of the tape and turning the chess pieces upside down are all things I thought of. It can only be considered a tie."
　　 "Okay, okay," Aihara Ai said with a small smile, "I'm the older sister, let you be a little brother."
　　 "By the way, how old are you?" Conan asked in a low voice.
　　 "Secret." Huihara smiled sadly.
"Damn it." Conan complained, and then watched Dr. Aka wave his hand behind him, and immediately said using Dr. Aka's voice with a voice-changing bow tie, "The murderer is Mr. Shirakura, yes, he killed Professor Hirota and found things from this house to clean up. The evidence was collected and the scene was set up, but he did not have an alibi, so he had to alleviate his suspicion and create a suspect."
　　 "Manufacture?" Henggou Police Department asked, "How is this made?"...