"Good evening." Dr. Agasa and Tanizumi brought two little radish heads into Professor Hirota's home.

"Ah, is it Dr. Agasa? I have heard from my husband about your affairs. Please come in." Professor Hirota's wife Toshiko Hirota welcomed several people from the entrance to the house.

"I'm disturbing. Have Professor Hirota's guests all gone back?" Dr. Agasa communicated with Mrs. Hirota who led the way in front.

"Yes, a few of my husband's students came to see him today, and they have all gone back now."

As he said that, the few people had already arrived at Professor Hirota's study door, and Mrs. Hirota knocked on the door.

"Honey?"

Du~du~du~du~du~

"Honey?"

"It's strange. I don't know what he's doing inside, and I locked the door."

Conan, who was on the side, couldn't wait, or was the son of Death who felt the breath of death, jumped to the door frame above the study door and looked inside through the glass window.

Not to mention that Conan could jump to a height of several times his height without opening black technology shoes. Sure enough, the house was in chaos, and an elderly man was covered by a dumped bookshelf, only his head was exposed, and blood dyed around him.

Conan let go and fell back to the ground, his movements were light, and he hurriedly spoke to Mrs. Hirota and asked, "Is there any spare key in this room?"

"No...nothing." Mrs. Hirota replied in confusion.

"Shuiquan, please help me open this door first." Conan said anxiously.

"Well, okay. Dr. Agasa, let's go together. With your weight, hitting the door has an advantage over me."

"Well......"

"Dr. Agasa should really pay attention to his weight. As he gets old, many elderly diseases will come to him if he continues like this." Haibara Ai said coldly.

Dr. Agasa patted his round belly and smiled helplessly.

"Hey, let's open the door first." Conan's head was covered in black, but there was still a corpse lying inside.

Dr. Agasa and Tani Mizuki began to hit the door. Conan's small physique was not very useful and was inappropriate, so Tani Mizuki rushed to the side.

Seeing these strange guests coming to their homes, jumping up and down again, and hitting the door with a disagreement, Mrs. Hirota was at a loss.

After several collisions, the study door opened with a bang, and several people hurried into the house to check. Mrs. Hirota, who was following behind, screamed in horror when she saw Professor Hirota lying in a pool of blood.

......

"You said this was an accident?" Dr. Agasa said in confusion.

"Well, although I'm not very clear, the possibility of accidental death is very high." Police Officer Henggou said.

"Before the investigation was completed, I started to make a rush to make a conclusion. Are you rushing home to sleep, police officer?" Gu Shuiquan said in a cold voice.

"You...I seem to have seen you somewhere." Police Officer Henggou said, looking at Gu Shuiquan in black.

"Izu, I have seen it twice, the fifth pagoda incident of the Fuzawa family's triplet murder incident." Tanizumi reminded in conciseness.

"Ah, I remembered it." Police Officer Henggou suddenly realized and then looked straight, "But you're a bit too much to say that. I'm serious about handling the case, so where are you rushing home?"

"Is that so quickly, I thought you died unexpectedly, and I thought you were anxious to go home."

"I originally wanted to help you solve the case quickly so that you can go home and rest quickly, but now it seems that it is no longer necessary."

"Uh...what do you mean, this guy..."

"Gushuiquan."

"Oh, Mr. Gu, have you already known the truth about this case?"

"almost."

"But the door of this room is locked, the glass on the door is locked, and the door key is also pressed under the book, which means that the room is a complete secret room."

Officer Henggou flipped up the book covered with the keys on the ground and talked about his thoughts.

"So, Professor Hirota can only lock the door himself and then try to climb the bookshelf, which accidentally caused the bookshelf to fall. What's more unfortunate is that the deceased's head hit the trophy, which led to his death. Is there anything wrong?"

"Look at that phone, don't you think there is something wrong?" Gu Shuiquan signaled to the Henggou police officer to look at the landline covered with books on the ground.

Officer Henggou squatted down seriously, stared at the phone for a long time, then looked back at Gu Shuiquan with a confused look on his face.

“Where is the problem?”

“…”

"Shuiquan should mean that the phone looked like it was slumped to the ground with the bookshelf, but the phone was turned over, but the microphone was still clamped on it. It was too deliberate. It was more like someone deliberately covered the book on it and messed up the room."

Conan explained in a calm tone, and the police officer Henggou on the side looked like he suddenly realized.

"Ah, by the way, you seem familiar, kid."

"Haha, that's right, he is actually my relative." Dr. Agasa quickly stood beside Conan and covered him.

"If you say this, then this is a murder in the secret room!" Police officer Henggou stood up, put his hands in his pockets, and said with a serious look on his face.

"Kill people! Who is it, who killed my husband?" Mrs. Hirota was very excited.

"Madam, calm down first." Officer Henggou comforted Mrs. Hirota's shoulders, then turned to Tani Shuizumi and said, "Since you already know that this is a murder case, are there any other clues?"

"I already know the method of killing. You can buy a volume of audio recordings first. It's the same model as the answering machine used on this phone."

Cassette? Why use this? Conan was thinking about how the prisoner sent the key back to the room. The key was pressed down by a book. If you use a rubber band, you can't do this.

The audio tape...is it...but how exactly is it done?

"Ah, OK." Police Officer Henggou suppressed his curiosity and arranged for his men to buy the tape first. "What's next?"

"First listen to the recording of the message on the phone."

"Ah! Yes, that's true." Police Officer Henggou suddenly realized.

Several people were all focused on the phone messages, and no one on the side of Haibara Ai was paying attention. She stood directly on the seat in front of her desk and began to typing on the keyboard and searching for information.

There are thirteen phone messages in total, including Shirakura Ten and Morioka two. There are many blank spaces mixed in the tape.

"Who is this Mr. Shirakura?" Officer Yokogawa asked Mrs. Hirota.

"I have seen Mr. Shirakura before, he is a young man."

"Where is Mr. Morioka?"

"I also know this. It is my husband's earliest student and often comes to my house to play."

"What's next? Are there any clues?" Officer Henggou looked at Gu Shuiquan again.

Tan Shuiquan suddenly felt that the Japanese police owed the detectives a salary...

Murder cases in Japan are all solved by a small number of detectives. This workload is basically a detective who has to support police in at least one city.

"Gloves."

"What?"

"Gloves." Tan Shuiquan stretched out his hand.
Chapter completed!