"What? Professor Hirota was killed? How is this possible.\" Later, Morioka, who had called to leave a message, arrived at the scene, obviously not believing it, and looked at Yokozo and said.

\"Not long ago, he was obviously fine.\" Next to Morioka was a man with glasses, and his expression was also incredulous.

\"I remember that the person who passed by Mrs. Hirota and came here was you, Mr. Hosoya?\" Yokozo asked, looking at the man with glasses.

\"Yes, because my daughter is going to apply for Nanyang University this time, I came here to ask the professor to help my daughter write a letter of recommendation.But I saw that the professor seemed to have drunk a lot of alcohol, so I gave up my mind and went back first.\" Hosoya replied to Yokomizo.

"Did the professor drink tonight?" asked Yokozo, turning to Mrs. Hirota beside him.

"Yes, from the evening.\" Mrs. Hirota replied affirmatively.

And on the other side.

\"The Order has also intervened in this matter, and it seems that they have noticed this.\" Gray Plains said as he looked at Conan.

"Anyway, it's enough to know that they didn't do it, all that's left is to find the murderer and solve the case.\" Conan replied with a smile.

"Oh, do you know the murderer's modus operandi?" asked, looking at Conan.

\"I have a clue.\" Conan replied as he looked at the answering machine.

\"Is it...\" Gray Yuan looked at Conan who was thinking, and then looked at Xiaobai who was sitting in the computer chair next to him.

\"Aren't you going to help him out?\" Gray Yuan walked up to Xiaobai.

\"Well, I think it won't take long for it to be solved.\" As Gray Plains asked, Xiaobai looked at Conan.

\"So, you already know the murderer's methods?\" Gray Hara asked with a pretended lightheartedness.

"Actually, it's just a simple trick that can't be simpler.\" Xiaobai replied with a smile.

"Oh?\" Gray Yuan looked at Xiaobai, but there was an indescribable feeling in his eyes.

...

\"Oh, you said this kid, he's been here.\" In the apartment where Masami Hirota used to live, Ashbara gave a picture to a neighbor nearby.

\"Thank you.\" Gray Yuan thanked him.

\"But it's a pity, I don't know what's wrong with that girl, she actually quit the house, she's pretty good.\" Masami Hirota's neighbor said.

\"That doesn't bother you.\" Gray Yuan said goodbye to the other party.

\"...\" Looking at the photo in his hand, Gray Yuan's brow frowned.

...

\"When else do you need to think about it?\" Graybara walked up to Conan.

\"Huh?\" Conan looked at Ashbara, unsure why.

"Isn't there a case for you that can't be solved?"

\"...\" Conan was silent.

"If it can't be solved, then get out of this dangerous place as soon as possible. The people of the organization may still be nearby. General.\" Gray Yuan said as he picked up the chess pieces and placed them on the answering machine in front of Conan.

\"Uh...\" Conan picked up the chess piece and stared.

\"General...\" Xiaobai smiled, this matter seems to have been resolved.

"Let's get out through the back door, Doctor.\" Gray Hara pulled the Doctor outside.

\"Wait a minute.\" Conan called out to Gray Yuan and Dr.

"Don't you want to know? The truth of this case.\" Conan stood up and put his hands in his pockets.

"Oh?\" Gray Plains looked at Conan.

\"As I said, there is absolutely no unsolvable case in this world.\" Conan looked at Gray Plains and said confidently.

...

\"I'm sorry, I have something to say goodbye tomorrow morning.\" Hosagiya said embarrassedly to Yokomizo.

\"Me too.\" Shirakura also conforms to the Tao.

\"I'm going back too.\" Morioka also complied, and then the three of them walked towards the door.

\"Wait, wait a minute.\" Henggou wanted to stop a few people.

\"You all stand for me.\" came the doctor's voice.

"Huh?\" A few people looked at the doctor.

"I already know the modus operandi and the murderer who created this chamber" Conan behind the doctor mimicked the doctor's voice with a bow voice changer.

\"What did you say?\" Henggou was stunned, as if they couldn't believe it.

"Really, it's impossible to commit a crime no matter how you look at it.\" Morioka retorted.

\"You're naïve, it's a real headache for the layman.\" The doctor said pretendingly.

\"Aren't you also a layman...\" Morioka shrugged his face and looked at the doctor.

"This room is indeed a secret room, and no matter how you look at it, it would be considered an accident, but the murderer can easily make this a perfect secret room with the tape of the answering machine and the chess pieces.\" The doctor said earnestly.

"Tapes of phone calls?\"

\"Western chess pieces?\" Morioka and Yokomizo one person sentence.

"Facts speak louder than words, so you can put on a show.\"Perform the trick you came up with in your head from beginning to end.\" Gray Yuan said from the side.

\"If I can't ask for it, then let Conan do me a favor and make the scene repeated.\" The doctor said.

...

\"Henggou landscape, I bought the tape back...\" A police officer outside the door said to Henggou.

\"Hm?\" Groove is unclear so.

\"It's the same size as the answering machine here.\" the officer said as he taped the tape across the ditch.

"Why? I didn't ask you to buy anything like this.\" Yokozo said dumbfounded, holding the tape.

\"But he told me...\" The officer pointed at Conan.

\"Alright, give me the strap quickly, officer.\" Conan said as he borrowed a glove and stretched out his hands to the gutter.

\"Oh...\" Yokozo brought the tape to Conan.

"First pull the tape out of the tape to the appropriate length, and then put it on the phone, then straighten the tape and walk out the door, then put the loop on the key through the tape, and then leave the key outside, take the rest of the tape and go back to the room where the notebook fell. Then put the three pieces of the same height into a triangle, and then put this end of the tape on the piece closest to the phone, and then put the notebook on it.\" Conan said, At the same time, the case is repeated.

\"It's nonsense, you may be trying to use the power of pulling the strap to knock down the chess piece, but unfortunately this is just a theory.The base of the Western chess piece is very stable, and the key will touch the chess piece before it falls, and it will be pulled out of the notebook.\" Gray Yuan retorted.

"What if you turn the pieces upside down.\" Conan holds the pieces and turns them upside down.

\"Although the head of the chess piece is round, as long as the material of this notebook is made of cardboard, it should be able to hold stably.\" Conan said as he turned the chess piece upside down.

\"Next, lock the door outside the door, put the key on the ground and start making a call.\" Then, the phone rang.

\"Because no one answers, the answering machine will be activated, and the tape will roll inside, and this force will cause the key outside the door to pass through the crack in the door below, and then reach the notebook designed in the center of the house. It's under the notebook.\" Conan said outside the door, while the people inside watched.Then, under the gaze of everyone, the key was pressed under the notebook.

\"I see, as long as the answering machine continues to start, the tape will be completely rolled up, and the evidence will disappear.\" Henggou watched the tape slowly roll in, and said the final answer.

"In this way, the person who can use this technique is...\" Yokozo said as he spoke.

\"It's only Mr. Shirakura.\" Yokozo looked at Shirakura.

\"Then you killed my husband...\" Mrs. Hirota looked at Shirakura emotionally.

\"Wait...\" Shirakura wanted to explain something.

\"There are traces of distortion in this tape, which is evidence of this technique.\" Henggou said as he walked towards Shirakura.

"Please wait a minute, the trick just now is very powerful, but how can you say that I did this thing?

\"That's because you want to get something back.yes, it's the tape with your fingerprints on it.\" The doctor's voice came.

\"...\" Hakura's expression looked very surprised and frightened.

"When I saw the tape just now, I found that there were a lot of fingerprints on it, so I decided that it was an impulsive crime. There are still fingerprints left on the tape, so you want to be the first discoverer of the corpse.After Mrs. Hirota confirmed with you that the scene was a secret room, I was looking for an opportunity to swap out this tape. If there is no sound on the phone call, no matter who you are, you will be suspicious, if you check it carefully, you can check that it has your fingerprints on it.In fact, you can go to Mr. Shirakura's house to check it now, and the professor's floppy disk should still be on his side.\" Conan imitated the doctor's voice behind the doctor, and finished the reasoning of the whole case in one breath.

\"So, can we go to your house and have a look?\" Yokozo asked Shirakura.

\"I parked the car outside the door, and there was a storage compartment in the car, and the floppy disks were all in it.

"What picture?" Yokozo asked.

"As I mentioned earlier, there was a magazine project to do a story on the surprising side of models, so I asked the professor to send me a photo of me in college dressed as a man.

"The face of the past?\" Yokozo asked.

\"I used to go to plastic surgery, just when I was a model.\ Even the name should be.\" Hakura replied.

"I thought that the photo was just right, and I couldn't see it with makeup and a wig.\The photo of a man dressed as a woman is also quite effective.Of course I can't take the past photo to the editorial department.I discussed with the professor and asked him to lend me this photo.And he said\"If you want to ask you about that photo of a man dressed as a woman, I forgot which floppy disk I put it in.But the photo I sent you will be found right away, do you want me to send it to the editorial office directly for you?\", after hearing this, my blood surged, By the time I came to my senses, Hirota had already collapsed in front of me.As for the rest of the matter, it was just as he said.\" Hakura replied as he reflected on what had happened.

\"Well, I'm going to take you to the police station.\" Yokogou said to Hakura.

\"Mr. Shirakura, please don't blame me for being too talkative, I think Professor Hirota's purpose must be to hope that you don't disguise yourself and can be more confident in yourself before sending you photos of your past.\" The doctor said as he looked at the handcuffed Hakura who had left.

"I wish I could have heard him say these things to me... It's a pity.\" Hakura bowed his head, then replied to the doctor, and was taken away from the scene.

\"The reasoning is really wonderful.\" Looking at the leaving Shirakura, Yokozo praised the doctor.

\"Where, is the floppy disk I poured here to get me now?\" The doctor asked, touching the back of his head and smiling.

\"That's not good, we have to take all the evidence back to the police station for investigation.\" Yokogou told the doctor with regret.

\"Well, then I'll go back with the kid first.\" The doctor replied to the gutter and walked out the door.

\"Alright, you can go too.\" Conan looked at Grayplain.

"Why? Why didn't you save my sister at the time?" asked Ashbara, tears slowly rolling down his cheeks...

\"Your sister?\" Conan seemed to have something in mind.

\"Don't you understand, Masami Hirota, it's Professor Hirota who got a fake name for my sister.\" Gray Hara replied to Conan.

\"...\" Xiaobai walked forward slowly.

\"Could it be...\" Conan remembered the man.

\"So she's your sister.\" Conan looked at Grayplain.

\"That's right, since you're so good at reasoning, you should easily see through my sister's affairs. But... Why?\" Gray Hara said, then knelt down, grabbed Conan's clothes and cried.

\"...\" Conan was silent.

\"...\" Xiaobai looked at the crying gray plain, and was silent.However, at this time, the smile on his face had long since disappeared.

\"Why... Why...\" Ashbara choked up.