"Misunderstanding what?"

Blinking, Gao Yuan asked a little dazedly.

Hearing this, Gray Yuan's face was slightly red, and he immediately turned his head, turned his back to Gao Yuan, and said lightly:

"It's nothing, just say it casually."

So, Gao Yuan didn't care, and continued to put his mind back to this incident, and began to recall all the things he saw and heard at the party, and then with the purpose of seeking knowledge, he asked Gray Yuanwai:

"By the way, after oral potassium cyanide, is there any explanation for the time of toxicity?"

After all, Gao Yuan only has a general understanding of cyanide, and knows that oral administration of cyanide will cause a "lightning" death that can be fatal in a few seconds, but there will also be cases where death occurs after a few minutes.

In this case, potassium cyanide was not detected in the food eaten by the deceased before his death, so it is a very important clue to analyze when the deceased took potassium cyanide.

In this regard, hearing Gao Yuan's serious request for advice from himself, the corners of Gray Yuan's mouth couldn't help but turn up slightly, stretched out his right hand wearing a "lover", stroked his sideburns, and began to explain with some pride:

"Well...... Simply put, look at the intake. When the ingestion amount is particularly large, the cyanide in the human mouth can be hydrolyzed and ionized to produce cyanide ions, and enter the cells through the mucous membrane, blocking cellular respiration. The whole process only takes a few seconds, and the person will suddenly pass out and have tonic spasms. But when death comes, it is two to three minutes later that the breathing and heartbeat stop. ”

Very detailed, Gray Yuan Wai first explained the principle of "lightning" death to Gao Yuan, and then began to explain another situation:

"And if the intake is not large, it is impossible to destroy the vital organs and tissues of the whole person in a short period of time with such a dose. As a result, most of the cyanide enters the stomach and reacts with gastric acid to form hydrogen cyanide, which dissociates cyanide ions and enters cells. In this way, death may take a few minutes to ten minutes, and the time required for a full stomach is even longer. ”

"I see, thank you, Grayplain!"

After listening to Gray Yuanai's explanation, Gao Yuan couldn't help but thank him from the bottom of his heart, and when Gray Yuan Wai heard Gao Yuan's thanks, he couldn't help but feel a little satisfied in his heart.

At this point, Gao Yuan has an idea-

In other words, when Katsuhiko is poisoned by Katsuhiko Mikawa, it is still possible to eat cake and drink coffee with everyone in the living room!

Thinking like this, Takato began to recall what had happened in the living room at the time - but the question was how did the murderer poison him? After all, when you're in the living room, everyone eats the same thing!

The coffee is poured from the same coffee pot, the cups are exactly the same, and the cake is taken at will.

Even if the murderer waited for Katsuhiko Minagawa to choose before poisoning it, the existence of the poison was not found in the subsequent examination.

What's more, I was also paying attention to the situation at the time, and no one had the opportunity to poison someone else's cake or drink.

Or is it that Katsuhiko Minagawa was poisoned earlier? Like the time before he went back to the living room?

Thinking of this, Gao Yuan looked at Conan, who was also thinking, and saw that he seemed to think of something, ran to Suzuki Sonoko's side, and asked coquettishly:

"Sister Yuanzi, did you see anything when you went out with Brother Kayan before?"

Seeing this, Ayumi on the side saw that she couldn't talk to Conan for a while, and then saw the conversation between Gray Yuan Ai and Gao Yuan who were very familiar with each other just now, and couldn't help but come to Gray Yuan Ai's side, and asked curiously and quietly:

"Gray Yuan-san, you are so familiar with this detective brother!"

"yes, what's wrong."

Bland, Gray Yuan glanced at Gao Yuan, and replied.

"He's amazing!"

Ayumi praised, "When I faced a department store bandit group before, he subdued the gangsters with guns in one fell swoop!" And Conan seems to be very good with him! ”

"So what?"

Glancing at Gao Yuan, Gray Yuan asked rhetorically.

"Gray Yuan-san, can you talk to this big brother and ask him to solve this case quickly, so that Conan won't talk to the big sisters like this!"

Ayumi said as she looked at Conan, who was talking to Sonoko Suzuki.

Hearing this, Gray Yuan couldn't help but smile, but he didn't say anything, after all, whether they can solve the case or not depends on themselves.

And Conan also asked Suzuki Sonoko at this time, and learned that Katsuhiko Minagawa and Katsuya Sekiya were childhood sweethearts, and at that time, Katsuko Sekiya chased out to give chocolates to Katsuhiko Minaga, but Katsuhiko Minagawa liked Watanabe so beautiful, so he didn't accept Katsuya Seki's chocolate, so when Sonoko Suzuki came back at that time, he would be disillusioned and eat the chocolate he was going to give.

"Well...... There was no sign of being poisoned everywhere, and it looked like it was probably a suicide. ”

After questioning the people at the scene, and knowing about the death of Katsuhiko's biological parents, Officer Twilight came to this conclusion:

Gu Xuan

"Moreover, you are all medical students, and it is not difficult to get potassium cyanide."

"What! How is this possible! Katsuhiko! ”

After listening to Officer Twilight's words, Katsuhiko's mother burst into tears.

"No, it won't! Mr. Officer! ”

Guan Guxiang also retorted in disbelief, "Although Katsuyan is a little self-defeating, but so many years have passed, why did he commit suicide!" ”

"Katsuhiko!"

Sitting on the sofa and witnessing the tragic situation of the person she loved before she died, Watanabe hid her face and cried.

"Officer Twilight, this is absolutely impossible! Mr. Minagawa can't have committed suicide! ”

At this time, Conan suddenly retorted loudly.

"That's right, a person who received chocolate on Valentine's Day, I don't think he would choose to kill himself."

Gao Yuan also immediately stepped forward and added.

However, if it was not suicide, it could only have been poisoned and killed, but until now, no toxic substances have been detected in all the things that the deceased ate before his death. I can't think of any other possibility than suicide by poisoning, wise brother. ”

Somewhat puzzling, Officer Twilight said.

In this regard, Takato and Conan really don't have an idea, but Katsuhiko Minagawa did not commit suicide, which is certain, not to mention the suspected threatening letter received by Watanabe Yoshimi, which can indirectly prove this.

"Hey, Mr. Akechi, when do you think Mr. Minagawa was poisoned?"

At this time, Conan asked Takato in a low voice.

"The biggest possibility is when you drink coffee and eat cake with everyone."

Gao Yuan also said——

Although according to Gray Yuanai, the poisoning time of a small amount of cyanide in a full state will be prolonged, but today Katsuhiko Minagawa didn't eat much, and Katsuhiko Minagawa didn't have the habit of taking capsule drugs like in the previous "Fusa-e" case, so the time from his poisoning to poisoning was only a few minutes at most.

"I think so too."

"But why was he the only one who was poisoned when everyone ate the same food?" It is also strange that no poison was detected in the food he ate afterwards. ”

"On that note, I already understand how the killer did it. But how the murderer was poisoned, I still don't have any idea. ”

After listening to Conan's words, Gao Yuan couldn't help but say.

"Huh? Does Mr. Wise already know who the murderer is? ”

"That's right, the murderer could only be that person."

Gao Yuan said, his eyes looked at a person, and following his line of sight, Conan also saw that person, and then, Conan suddenly realized, revealing a clear look:

"Sir Wise, I know, the murderer's method of poisoning! I saw through this poisoning method in front of everyone! ”

"Huh?"

Gao Yuan couldn't help but be stunned for a moment, but when he heard the words "in front of everyone", he immediately figured out the pass:

"I see, then this incident has been solved!"

But Conan scratched his head helplessly at this time:

"But, Mr. Wise, motives! Motive for killing! Reasoning without understanding motivation is incomplete! ”

"Huh? I know that. ”

Gao Yuan said, squatting down and whispering a few words to Conan.

And looking at this scene, Gray Yuan silently watched the communication between the two detectives, as well as the expressions on their faces, and couldn't help but slightly curl the corners of his mouth-

"Yoshida-san, it looks like they've solved it—this incident!"