Ran quickly helped Conan up, touching his forehead. Her worry was evident on her face: "He's burning up! He has a really high fever!"
Inspector Megure quickly ordered his officers to call an ambulance, then looked around and asked, "Hey, where's Heiji Hattori?"
The butler, Koike, replied, "That young man just asked for directions to the Japanese-style room and then left."
Although Conan was in a lot of pain, he didn't faint. Hearing that Heiji had gone to the Japanese-style room reminded him of something, but given his current physical condition, well, it's hard to say.
Inside the Japanese-style room, Heiji found something in the trash can, a smile appearing on his face as he thought to himself: Shinichi Kudo, this time, I, Heiji Hattori, am going to beat you!
Ran couldn't let Conan lie on the study floor forever, so Takayoshi Tsujimura said, "You can let this child lie in my room, the one at the end of the corridor."
Ran had just stepped out of the study with Conan in her arms when she happened to see Heiji Hattori walking in with a smile on his face.
Heiji then addressed the crowd, saying, "I already know the method used to create the locked room, and of course, I also know who the murderer is!"
Hearing this, everyone looked at Heiji in shock. Inspector Megure, standing next to him, gave the bewildered Mori a disdainful look: "Aren't you usually so amazing? Why are you so useless today?"
Uncle Mori wanted to explain, but he didn't know how. Was he supposed to say that he always fainted when solving cases?
Conan, nestled in Ran's arms, caught a glimpse of the fishing line in Heiji's hand from the side and seemed to remember something. However, Ran didn't let Conan stay in the study any longer, and Conan, seeing the study getting further and further away from him, couldn't help but feel a sense of helplessness.
Heiji said to everyone, "As I mentioned before, all the windows in the room were locked from the inside, and the only door was also locked at the time. Although it seems like an impossible locked-room murder case with no gaps and no chance of escape."
Heiji paused, then pointed to the study door and said, "Actually, there's a gap in this seemingly secret room!"
Uncle Mori looked closely at the study door that Heiji was pointing to and noticed the gap under the door. He said with a hint of sarcasm, "You don't mean the culprit slipped the key into the victim's pocket through this gap, do you?"
Heiji took out a fishing line from his pocket and said, "You're absolutely right. As long as I have the tape and the fishing line I just found for tying iron hooks, that's all I need!"
Uncle Mori looked at the fishing line, thinking for a long time but still couldn't figure out why he said that.
The scene shifts, and Kōyū, having finished using the restroom, is humming a little tune as he walks back to his study. He watches as Ran carries Conan into a room at the end of the corridor, and Kōyū looks up, deep in thought.
However, Guangyou didn't understand either. Having no interest in the case, he hurriedly followed Xiaolan into the room.
When they went inside, Ran was comforting Conan. Turning around and seeing Kouyu arrive, she said to him, "Kouyu, could you watch over Conan for me? I'll wait for the doctor outside!"
After saying that, Ran hurriedly ran out. Kōyū looked at Conan on the bed. Conan was panting heavily and said to Kōyū, "Kōyū, I feel... my heart hurts so much! It's so hot! It feels like it's going to burst! Kōyū, can you help me! I don't want to lose to that charcoal-headed guy!"
It seemed that only then did Kōyū realize that Conan was going to turn back into Shinichi in this episode, so he wasn't flustered at all and waved his hand, saying, "It's okay, it's okay! You'll find out soon enough."
Conan didn't have time to argue with Kōyū, and was panting heavily, clutching his heart as if he was in pain.
On the other side, Heiji held the needle in front of Megure, who was lying on the ground. Megure stared at the needle nervously, terrified that if he mishandled it...
Heiji ignored Megure's nervousness, brandishing the needle at Inspector Megure, and then said to everyone, "This is how the murderer does it: First, he inserts a poisoned needle into the victim's neck, kills him, then steals the victim's keys, pulls out the fishing line with the needle attached, uses the fishing line to secure the other end of the needle to duct tape, then ties one end of the needle back on, stuffs it into the victim's pocket, and then passes the fishing line through it..."
Heiji pulled the lifeless Inspector Megure along and made him sit at the desk with his hands on his face. "In the end, have the victim sit in this position on the chair. Then, just hold both ends of the fishing line and walk out. You can pull the fishing line out through the crack in the door. Then close the door, lock it, tie the fishing line to the key, and pull it over."
As everyone listened to Heiji's reasoning and watched his actions, the key, just as Heiji had predicted, fell directly into Inspector Megure's pocket.
Although he didn't want to admit it, Inspector Megure couldn't deny the correctness and feasibility of this method.
Heiji originally wanted Shinichi Kudo to come out and have a match, but after waiting for a while, Shinichi Kudo did not appear as expected.
Heiji smiled and said to everyone, "After killing the victim, it would take 5 to 6 minutes to complete the method I described. Fan Sui's time was from 3:30 to 4:00, so Mrs. Tsujimura, who came back here with us, is ruled out. Of course, Mr. Koike, the butler, is also not a suspect. Although Mr. Takayoshi Tsujimura and his girlfriend went to the second floor at that time, they did not have enough time, so they are also ruled out."
Heiji turned to look at Tsujimura Toshimitsu and said, "Only you, sir, only you have this possibility! The evidence is the fishing line I found in the Japanese-style room just now, the one used to tie the iron needle. This kind of fishing line is a special kind of new material fishing line. You can't be unaware of that, can you?"
Seeing the somewhat flustered look in Tsujimura Toshimitsu's eyes, Heiji continued, "I remember we ran into you on our way to the study, and you seemed to be heading to the Japanese-style room at the time. That means you went to the Japanese-style room after committing the crime. You must have thought you did the perfect thing, right? The fishing line I found in the trash can in the Japanese-style room is the strongest piece of evidence!"
At that moment, Ran pushed open the study door, looked at everyone, and asked, "Have you seen Conan? And Mitsuyu too? They just disappeared."
Apart from the two police officers, no one paid any attention to Ran, as their attention was entirely focused on the murderer. Seeing this, Tsujimura Toshimitsu lowered his head and said, "That's right, it's me!"
Heiji smiled, thinking to himself: I won! Kudo!
At that moment, a voice rang in everyone's ears: "No, you didn't kill anyone! This old man is lying!"
Everyone looked towards the sound and saw a confident man in a blue suit standing before them—it was none other than Shinichi Kudo!
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