"Then who killed my husband?" Mrs. Hirota grabbed the ditch and asked, "There is no spare key in this room......

"This," Henggou glanced at Gao Cheng and said with a dry smile, "Calm down, madam, aren't we investigating?" Did any suspicious person visit the professor tonight? ”

"There seem to be two or three other people coming over besides the detectives from the city," Mrs. Hirota replied, pointing at Gao Cheng, "because I happened to be attending the township meeting in the town, so I don't know ......."

"Township assembly?"

"Yes, I went with the wives in the neighborhood, I went out at eight o'clock and came back at eleven o'clock, and Mr. Joto called me when I went out."

"Madame, you didn't see any guests coming to your husband tonight, did you?" Henggou said with a headache.

"I did see the first guest who came here," Mrs. Hirota recalled, "and I happened to be out with the wife next door, and my husband said that he was a former student, and his surname seemed to be Hosoya...... I've only heard the others say that there will be two or three students coming to see him......"

"It's gone," Gray Yuan suddenly said as he checked his computer next to him, "Not only are all the magnetic sheets missing, but even the data in the computer seems to have been washed away!" ”

"Huh?" Henggou was shocked when he heard this, and looked back at the gray plain who was touching things, "Who is this child?" ”

"She's my assistant." Gao Cheng squatted next to the corpse and said while inspecting the scene.

"Help, assistant?" Henggou pointed at Gray Yuan and Gao Cheng blankly, and said with a dry smile in sweat, "Detective Chenghu...... He's really a detective, this kid seems to be quite powerful......"

"Officer Henggou," Gao Cheng looked at the phone that was upside down on the ground, and there was a book on it, "This seems to be a telephone answering machine, can you listen to the answering machine recording first?" ”

"Oh, it's been verified in the field, and it's no problem to flip now." Henggou reacted and hurriedly pressed the button of the answering machine with gloves on.

"There are 13 messages in total......"

The investigation was carried out in an orderly manner, but Gao Cheng thought of those men in black in his heart.

Once he is targeted by those guys, things can get quite troublesome, and not only him, but also the people around him will be in danger.

"You'd better not meddle in this case," Gray Yuan reminded as he stood aside, "and they're probably still staring at this ...... right now."

"You think those guys did it?"

"It's very likely, as you said before, that it's not difficult for them to find the magnets, because the records of the loss of the magnets and the records of the things I sent out at that time are all left in the organization."

Gray Yuan said and looked at Gao Cheng: "No matter what, if you are involved in the organization's case, it will still be too dangerous for you." ”

"It's too early to say that," Conan shook his head, "and it's not certain that it has anything to do with them, this case doesn't look like theirs." ”

"Excuse me, has something happened?" A young man appeared at the door, "I'm Shirakura ...... who made an appointment with the teacher to meet"

"You're the white cang? Professor Hirota has been murdered, perhaps by someone who has visited. ”

Henggou listened to 12 phone messages in a row, and said in a deep voice: "Mr. Morioka has 2 calls, but Mr. Shirakura you actually have 10 calls, it's too much, right?" ”

"This," said the young man anxiously, "because I called so many times and no one answered, so I came to take a look, and I didn't expect anything to happen to the teacher." ”

Henggou looked at the young man suspiciously, and continued to check the message: "Next is the 13th pass, the last message." ”

"Drop! Hello...... I want to needle our new ...... Insurance Product ...... Let me tell you...... Could you please take a moment...... I will call again......"

"It's an insurance salesman." Yokozo frowned, turned around and asked the police officer to find Morioka in the message, as well as Hosaya who came to visit at the beginning.

"No," Conan's face froze, "although the voice has changed a little because of the machine, this tone ...... This voice ......"

"Vodka," Gray Hara said suddenly, "this is the voice of vodka, it seems that this incident was not done by them, if they did, the first task would not be to set up the secret room, but to retrieve the audio tape with the sound recording." ”

Conan also followed: "In other words, they haven't arrived here yet?" ”

"If they find out that there is a police investigation here, they will probably have a headache too," Gray Yuan chuckled, "because the tapes are no longer recoverable, and even the magnetic tapes are missing." ”

"Organize......"

Gao Cheng couldn't interject next to him, just muttered about his impression of the black-clothed organization in Conan.

It was seen as a joke before, because the main characters seem to be either undercover or not very reliable except for Gin, and there are many betrayals of the organization, but when it comes to it, it still feels quite mysterious and terrifying.

The black-clothed organization is hidden in the dark, and it is not as simple as in the anime, otherwise it would have been eliminated by the undercover agents.

At least it wasn't too difficult to deal with his little detective.

Gao Cheng's eyes narrowed slightly.

The killers of this organization are not as easy to deal with as the female killer who used steel wire as a weapon......

Gray Yuan held his little hand behind his back, his gaze turned to the silent Gao Cheng, and his cold gaze tightened slightly: "Forget it, lock the door outside the room, and get the key into the center of the room again, and it happens to be pressed under the notebook, which is impossible in terms of physics......"

"Impossible?" Gao Cheng came back to his senses.

"Yes, I can't even use the cassette tape on the answering machine, although there are a lot of doubts, but considering that I have been drinking...... It is not entirely impossible that he fell along with the bookshelf and hit the back of his head, causing this accident. ”

Gray Yuan didn't want Gao Cheng to continue to mix, closed his eyes, and said softly: "And it's dangerous to continue to stay here, Chenghu, you can't go on like this......"

"No way?" Gao Cheng raised his eyebrows, and his gaze swept tightly over the scene of the murder.

It's true that just like Gray Yuan said, this secret room is very different, and Professor Hirota's body is also full of alcohol, which seems to be really an accident, but what Officer Yokomizo said is also very reasonable, and he is ...... Or with Conan here, the possibility of an accident is still quite small, especially when there are many suspicions on the scene.

Yokozo was still interrogating a few visitors on the side, the young man Shirakura, who had too many phone messages, Hosoya, the head of the securities company who was the first to visit, and the veterinarian Morioka, who often played chess with Professor Hirota.

All three are suspects......

Gao Cheng pursed his lips and stood next to the answering machine, and saw that the forensic personnel were investigating the tape of the answering machine.

The suspiciousness of the strap is that the sound is intermittent, and the murderer may have used the strap to do something......

The doors and windows of the room were locked, and the only way to let the key into the room from the outside was a small gap under the door, and it was impossible to press the key under the laptop with the tape strap alone.

Gao Cheng's gaze turned to the bookshelves and the books scattered all over the ground, and closed his eyes silently while frowning.

When he opened his eyes again, all the details of the entire murder scene appeared in front of Gao Cheng's eyes.

Bookshelves, murder weapons, corpses, scattered bookshelves, upside-down telephones, audio tapes with choppy sounds, room keys pressed by notebooks......

The superfluous details faded away, and at last only a notebook and answering machine were left in a line with the crack in the door.

Gao Cheng's eyes fell on the Western chess pieces scattered around the notebook, and all the details in his mind began to reappear in reproduction of the scene.

"Let's go," Gray Yuan urged, "let's get out of the back door quickly......"

"You guys go first," Gao Cheng said as he exited his mind space and turned to Conan and Dr. Kasa, "I'll take care of it here." ”

"Huh?" Gray Yuan looked at Gao Cheng in a daze.

"Have you already solved the murderer's methods?!" Conan was surprised, he was also sure that it was not an accident, but the secret room was stuck and couldn't be solved.

"There's something special about my way of reasoning."

Gao Cheng bent down and picked up a Western chess piece: "These chess pieces are the key, the keys and the chess pieces around the notebook are not meaningless and scattered, the truth of the facts ......"

In Conan's thoughtful gaze, Gao Cheng picked up the notebook, placed the three Western chess pieces in front of the answering machine to form a triangle, and then turned to Mrs. Hirota and asked, "Do you have any spare tapes?" ”

"Ah," said Mrs. Hirota, "yes, yes, my husband seems to be in a drawer under his computer......

"What is this?" Conan stared at the chess pieces with a shocked expression, and a bright light flashed through his mind.

Gao Cheng got the spare tape and began to arrange it in front of the police officer Henggou and the crowd, first pulling the tape out of the tape to a sufficient length, then putting the tape into the answering machine, and then pulling the exposed tape straight out of the door and through the key ring.

"Conan, can you help?"

"Good!"

Conan, who reacted, raised his hand, ran to the door in the face of Officer Henggou's puzzled gaze, pulled the strap through the key ring back to the study, and finally put it on a Western chess piece near the phone, and finally put the notebook on the chess piece placed in a triangle.

Gray Yuan crossed his arms to take in the whole arrangement, and chuckled, "Are you planning to use the power of the tape to pull down the chess pieces?" This is just theoretical, the base of the chess is very stable, so before it falls, the key will definitely be carried out of the notebook with the chess pieces, and it will not be pressed under the notebook at all......"

"What about the other way around?" Conan further arranged, "Although the head of the chess piece is round, as long as the material of the notebook is hard paper, it should be able to hold stably. ”

When Gray Yuan saw Conan's arrangement, his eyes shrank, and he looked straight at Gao Cheng at the door.

Gao Cheng took out his mobile phone: "Let's do the experiment now." ”

After closing the door and using a key wearing a strap to simulate locking the door, Gao Cheng placed the key in front of the crack in the door, and then used his mobile phone to call the phone in the room to leave a message.

As the answering machine starts, the tape automatically rewinds, and the key is gradually pulled through the crack in the door to the notebook supported by the chess pieces, and soon after reaching the bottom of the notebook, it hits the chess pieces again......

"In, in!" Officer Henggou and several other suspects watched in horror as the key was pressed under the notebook, and the 3 chess pieces fell around the notebook, everything was similar to the original scene.

Even the rest of the tape rolls up the deck smoothly.

"You can really ......"

"Of course," Gao Cheng returned to the study, "This technique may seem surprising at first glance, but it is not particularly subtle, I am afraid that it is just a temporary method that the murderer thought of in a panic, so he left a lot of suspicious places, and even left decisive evidence......

"Mr. Shirakura, who left a message 10 times, the murderer is you!"

"Wait, wait!" The young man Bai Cang stood in the crowd and suddenly became the focus, and said with a dry smile on his pale face, "What kind of evidence is this?" I just left a lot of comments......"

"Then why did you go out of your way to get back to the scene?" Gao Cheng interrupted.

"Didn't I say that? Of course, it was because the phone couldn't get through, so I came over......" Bai Cang looked at Gao Cheng, his voice became smaller and quieter, and his teeth involuntarily began to chatter.

"It's because you're trying to get back the fingerprint-stained tape, right?" Gao Cheng continued, "Originally, I was going to be the first discoverer with Mrs. Hirota, but I didn't expect someone to find out in advance, and even the police arrived, am I right? As for the motive for the killing, I'm afraid it's the disk ......"

"All the disks are in the car outside me," Hakura gritted his teeth with his fists clutched, "It's all because of that photo." ”

"The picture?"

"I had plastic surgery when I was a model, and even my name was changed, but the photo of the front face was left with the professor......"

"So you killed the professor because of that?"

"How is that possible?" Bai Cang said uncomfortably, "Recently, the magazine planned an event, and I originally wanted to ask the professor to borrow a photo of me in a man dressed as a woman on the anniversary of my university, because the relationship between makeup and wig can't see the original appearance, and it is also more special...... But the professor said......"

Bai Cang looked at Professor Hirota on the ground: "'I've forgotten which disk you swept into with a photo of a man dressed as a woman, if it was the ordinary photo that was sent to you, I would have found it immediately, do you want me to send it directly to the editorial department?'" He laughed at me so drunkenly that by the time I came to my senses, he had already collapsed in front of me......"

Bai Cang smiled bitterly: "Next, just like Detective Chengto, it's really a bit hasty, but I didn't expect that a detective would come over, and he saw through my methods at once, it's too ironic." ”

Henggou solemnly handcuffed Bai Cang: "Let's go, go back to the police station." ”

"Hey, Ah Cheng," Dr. Ah Ka anxiously reminded Gao Chengdao, "I still have to get that disk back!" ”

Gao Cheng nodded and found the horizontal ditch alone.

Although the evidence must be sent to the police station for investigation first, it is not without room for negotiation, especially in the face of the good old man Henggou.

"Officer Henggou, that disk has nothing to do with the case in the first place, we came today to rush to find Professor Hirota to get the disk back, even if we take it, it doesn't matter, right?"

"This ......"

……

Outside the Joto Detective Office, Ash Yuan silently followed Gao Cheng downstairs, and when he came back from Shizuoka Prefecture, Ash Yuan lowered his head and said nothing all the way.

Gao Cheng stopped and looked back at the silent gray plain: "Even if I don't ask for the disk back, I don't have to be so sad, right?" I'll figure it out......"

Gray Yuan slowly raised his head, revealing a small face with blurred teary eyes: "Why?" Why didn't you save my sister in the first place? ”

Gao Cheng's pupils tightened suddenly, and he met the eyes of Gray Yuan crying in a daze: "It's not that I don't want to save it, it's just that I ......"

Dusty memories came back to Gao Cheng's heart, it was what happened before he crossed over.

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