Chapter 684: The Secret Room Revealed in an Instant

Chapter 684: The Secret Room Revealed in an Instant

The aunt looked at the two young men with horror as a little kid started investigating in the room.

Yuya took a look, poked Kudo Shinichi with his finger, and said, "It's starting to stiffen."

Conan touched the charcoal stove and said, "The charcoal stove has gone cold."

Hattori Heiji was even bolder, he directly lifted up the clothes of the corpse and said: "The corpse spots have begun to appear on the back."

Yuya looked towards the window, where a few books were stacked on the floor. His eyes shifted to the bookshelf by the wall: "And those books used as footstools..."

The three of them looked at each other and nodded at the same time.

Yuya was the first to speak: "It looks like it's correct."

"Yes." Conan and Hattori Heiji nodded.

The aunt said in a panic: "Anyway, I'll call the police first..."

"Wait." Youya stopped her, stood up, put one hand in his pocket, and squinted at the aunt, "Before that, we have a few things to ask you."

Conan took over the conversation: "Why did you kill this uncle?"

"Eh?" The aunt's face suddenly changed, and she looked at the two in horror, "Why, why do you say that?"

Hattori Heiji raised an eyebrow: "Shouldn't we be the ones asking this question? Could it be because of some demon dog's curse?"

The auntie was sweating profusely and argued: "What are you talking about? I'm just a caregiver, and I just came back from shopping. I don't know what happened!"

"Besides," the aunt looked at the tape on the door, "isn't this door sealed with tape? When I came over, weren't you two still tearing off the tape on the window?"

"Also, there's an extinguished stove over there. Whoever comes here and sees it will think it's suicide by burning charcoal, right?"

"Is that so?" Yuya said calmly, "This old man's back pain is so severe that he can't go to work, so why is he using books from the bottom of the bookshelf, where he has to bend down to get them, to use as a footstool?"

There was an extra space at the bottom of the bookshelf by the wall, which was just enough to hold the books under the window. "Apparently" it was used as a footstool by the deceased when he "committed suicide" to stick the upper part of the window sash with tape.

"This..." The auntie forced a smile, "The books that are easy to get must be the ones he reads often, right? He doesn't want to use those books he likes as a stepping stone for suicide, so..."

Conan took out the coal from the charcoal stove and asked the old lady in a puzzled manner: "It's so strange, this coal doesn't feel hot even if I hold it in my hands."

The aunt explained: "Little brother, you may not know..."

"Burning coal in a closed room will deplete the oxygen in the air, causing incomplete combustion and producing carbon monoxide. When people inhale carbon monoxide, they will suffocate and die due to lack of oxygen..."

Da Sheng looked at Conan with horror on her face. She didn't understand why a child could explain the principle of coal suicide so fluently.

Conan looked up, a light flashing on his glasses. "You mean, the oxygen in the room will be exhausted, and then the coal will go out, right?"

"Yes, that's right..." the auntie confirmed with trembling eyes.

Yuya said dimly, "This uncle's back injury is so serious. If we want to seal the room with tape, it will take at least 10 minutes, right?"

He looked at the aunt, who was already sweating. "We first came here and saw Mr. Shinichi about 30 minutes ago. If you want to use a small charcoal stove to fill the room with carbon monoxide, the remaining 20 minutes will not be enough.

Even if the carbon monoxide did fill the room and cause the coals to go out, 20 minutes would not be enough time for the coals to cool completely.”

Yuya bent down and poked the coal in Conan's hand with his finger: "It's completely cold, otherwise a child wouldn't hold it in his hand so casually."

"That is to say, the coal was actually left there for quite a long time after it was extinguished!"

Hattori Heiji leaned against the bookshelf with one hand in his pocket, the corner of his mouth slightly raised: "In other words, the coal in the charcoal stove was not ignited at all, so the murderer had time to enter the room and completely seal the door and windows with tape."

The auntie seemed to have grasped some key words and retorted excitedly: "No, don't be silly, are you trying to say that I was in this room just now? You should have seen it just now, I just came back from outside!"

Yuya pointed to the door and said, "Isn't it okay if I just hide there?"

The aunt's pupils suddenly shrank - after the door opened, it happened to block the bookshelf, leaving an invisible space inside, which was enough for the aunt to hide in.

Yuya continued, "At that time, our attention was drawn to the door and windows sealed with tape, and with the charcoal stove, we naturally thought that the person inside had committed suicide by burning charcoal..."

Conan: "People who come in will pay special attention to these things and ignore what's behind the door..."

Hattori Heiji: "You can hide behind the door without being seen..."

Yuya: "When we rushed in again, while he was busy tearing off the tape and moving the charcoal stove, he quietly walked to the door and pretended to have just returned..."

Conan: "And in order to slow down the temperature drop of the deceased, the temperature in the room was deliberately raised..."

Yuya: "But, the body has started to stiffen..."

Hattori Heiji: "There are corpse spots on his back, which means..."

Conan: "That means this uncle has been dead for more than an hour."

Yuya: "If you still don't want to admit it, we have evidence too. It's on the tape."

Hattori Heiji: "Tape that's so sticky would take too much time if you were wearing gloves. And fingerprints would be on it when you're tearing it off anyway, so you can use this as an excuse to get away with it."

After saying that, he and Youya looked at each other, and the latter smiled and said, "It's a pity that you didn't expect that the two of us moved too fast, so you didn't have the opportunity to join in and tear off the tape, so this method couldn't succeed."

The two and a half detectives' reasoning, one sentence at a time, instantly broke down the aunt's psychological defenses.

"What are you?" The auntie turned pale and shouted in fear, "Who are you?"

Hattori Heiji smiled smugly and said, "Didn't we introduce ourselves when we came here and rang the doorbell?"

Yuya's lips curled up slightly: "We are detectives."

"No, no!" The aunt trembled all over, "This is different from what we agreed on!"

The three of them immediately showed a puzzled expression: "What are you talking about?"

The aunt said with an unpleasant expression: "That person said that the person who came here today was just a child detective..."

Yuya and the other two let out an unhappy sound.

Yuya curled his lips, glanced at Kudo Shinichi who had been lying on the ground for a long time, and said: "It's not a big deal about the child... This uncle said such a thing?"

"That's what the murderer said!" the aunt screamed, "He said the other party was just a child and that we could get away with it as long as we followed his instructions!"

"murderer?!"

Yuya and the other two's expressions suddenly changed.