Hearing this, Hui Yuan Ai's face turned red, and he immediately turned his head, with his back to Gao Yuan, and said calmly:
"Nothing, just saying casually."
Therefore, Gao Yuan didn't care and continued to put his thoughts back to this incident. He began to recall everything he saw at the party. Then, with the purpose of seeking knowledge, he asked Haiyuan Ai:
"By the way, Haiyuan, after taking potassium cyanide orally, is there any comment on the time when the toxicity will occur?"
After all, Gao Yuan only had a general understanding of cyanide. He knew that oral administration of cyanide would lead to a "flash" death in a few seconds, but there would also be cases where death would occur after a few minutes.
In this incident, potassium cyanide was not detected in anything the deceased ate before his death, so analyzing when the deceased took potassium cyanide is a very important clue.
In this regard, after hearing Gao Yuan earnestly asking for advice from him, Haiyuan Ai couldn't help but raise the corners of his mouth slightly, stretched out his right hand wearing the "lover", smoothed his hair, and began to explain with some pride:
"Well... to put it simply, it depends on the amount of intake. When the amount of intake is particularly large, the cyanide in the human mouth will be hydrolyzed and ionized to produce cyanide ions, and enter the cells through the mucous membrane, blocking cellular respiration. The entire process
It only takes a few seconds for a person to suddenly faint and have a tonic spasm. But when death comes, breathing and heartbeat stop after two to three minutes."
Very carefully, Haihara Ai first explained the principle of "lightning-style" death to Gao Yuan, and then started to explain another situation:
"If the intake is not large, it is impossible for such a dose to damage the entire person's vital organs and tissues in a short period of time. In this way, most of the cyanide will enter the stomach and react with gastric acid to generate hydrogen cyanide, which will be decomposed
The cyanide ions are released and then enter the cells. In this way, it may take several minutes to ten minutes to cause death, and the full state will take even longer."
"That's it, thank you, Haiyuan!"
After listening to Hui Yuan Ai's explanation, Gao Yuan couldn't help but thank him from the bottom of his heart, and when Hui Yuan Ai heard Gao Yuan's thanks, he couldn't help but feel a little satisfied in his heart.
At this point, Gao Yuan had an idea——
In other words, the time when Minagawa Katsuhiko was poisoned by potassium cyanide was probably in the living room, eating cake and drinking coffee with everyone!
Thinking like this, Gao Yuan began to recall what happened in the living room at that time - but the question is how the murderer poisoned him? After all, everyone ate the same thing in the living room!
The coffee was poured from the same coffee pot, the cups were exactly the same and everyone chose them at will, and everyone took the cake at will.
Even if the murderer waited for Minagawa Katsuhiko to finish his selection before poisoning the inside, the subsequent identification did not reveal the presence of poison.
What's more, I was also paying attention to the situation at the scene. No one had the opportunity to poison other people's cakes or drinks.
Or was Minagawa Katsuhiko poisoned earlier? For example, before he returned to the living room?
Thinking of this, Gao Yuan looked at Conan who was also thinking, and saw that he seemed to have thought of something, ran to Suzuki Sonoko, and asked coquettishly:
"Sister Sonoko, did you see anything when you followed Brother Katsuhiko out before?"
Seeing this, Ayumi on the side couldn't talk to Conan for a while, and then saw the very familiar conversation between Haihara Ai and Gao Yuan just now. She couldn't help but get closer to Haihara Ai and asked curiously:
"Haihara-san, you look so familiar with this detective brother!"
"Yes what's the matter."
Calmly, Haiyuan Ai glanced at Gao Yuan and replied.
"He's so awesome!"
Ayumi praised, "When he faced a group of robbers in a department store before, he subdued the gangsters with guns in one fell swoop! And Conan seemed to be very close to him!"
"so what?"
After stealing a glance at Gao Yuan, Hui Yuan Ai asked.
"Haihara-san, can you talk to this big brother and ask him to solve this case quickly, so that Conan will not chat with the big sisters like this!"
Ayumi looked at Conan who was talking to Suzuki Sonoko and said.
Hearing this, Haiyuan Ai couldn't help but smile, but didn't say much. After all, it was up to them to solve the case.
At this time, Conan also asked Suzuki Sonoko and learned that Minagawa Katsuhiko and Sekiya Kaoru were childhood sweethearts. At that time, Sekiya Kaoru chased her out to give Minagawa Katsuhiko chocolates, but Minagawa Katsuhiko liked Watanabe Kaomi, so he did not accept Sekiya Kaoru's chocolate.
Therefore, when Suzuki Sonoko came back at that time, she was disillusioned and ate the chocolate she was going to give.
"Well... there are no traces of poisoning everywhere. It looks like it could have been a suicide."
After questioning the people present and learning about the death of Katsuhiko’s biological parents, Officer Megure came to this conclusion:
"Besides, you are all medical students, so it is not difficult to obtain potassium cyanide."
"What! How is this possible! Katsuhiko!"
After hearing what Officer Megure said, Katsuhiko's mother burst into tears heartbroken.
"No! Mr. Police Officer!"
Sekiyaka retorted in disbelief, "Although Katsuhiko has given up on himself, so many years have passed, why would he commit suicide!"
"Katsuhiko!"
Sitting on the sofa and witnessing the tragic scene of the person he loved before his death, Watanabe covered his face and cried.
"Officer Megure, this is absolutely impossible! Mr. Minagawa cannot commit suicide!"
At this time, Conan suddenly retorted loudly.
"Yes, I don't think a person who accepts chocolate on Valentine's Day will choose to commit suicide."
Gao Yuan immediately stepped forward and added.
"However, if it was not suicide, it could only have been poisoned. But so far, no toxic substances have been detected in anything the deceased ate before his death. Apart from committing suicide by taking poison, I really can't think of anything else.
What's possible, brother Mingzhi."
It’s a bit confusing, said Officer Megure.
Takato and Conan really have no idea about this, but Minagawa Katsuhiko did not commit suicide. This is certain, not to mention the suspected threatening letter received by Komi Watanabe, which can indirectly prove this.
"Hey, Mr. Akechi, when do you think Mr. Minagawa was poisoned?"
At this time, Conan asked Gao Yuan in a low voice.
"The most likely thing is to drink coffee and eat cake with everyone."
Gao Yuan also said——
Although according to Haibara Ai, the poisonous time of a small amount of cyanide will be prolonged in a full stomach, Minagawa Katsuhiko did not eat much today, and Minagawa Katsuhiko was not like in the previous "Fusa-e" case.
If he has the habit of taking capsule drugs, then the time from when he is poisoned to the onset of the poison is only a few minutes at most.
"I think so too."
Conan said, "But when everyone ate the same food, why was he the only one who was poisoned? And it was strange that no poison was detected in the food he ate afterwards."
"Regarding this, I already understand how the murderer did it. But how the murderer poisoned him, I still have no idea."
After listening to Conan's words, Gao Yuan couldn't help but say.
"Hey? Mr. Mingzhi already knows who the murderer is?"
"Yes, the murderer can only be that person."
Gao Yuan said, looking towards a person. Following his line of sight, Conan also saw that person. Then, Conan suddenly realized and showed a look of understanding:
"Mr. Mingzhi, I know the murderer's poisoning method! I saw through this poisoning method in front of everyone and without anyone noticing!"
"Why?"
Gao Yuan couldn't help but be stunned for a moment, but after hearing the words "in front of everyone", he immediately figured it out:
"I see, then this incident has been solved!"
But Conan scratched his head helplessly at this moment:
"But, Mr. Akechi, the motive! The motive for killing! Reasoning without understanding the motive is incomplete!"
"Ah? I know about this."
Gao Yuan said, squatting down and whispering a few words to Conan.
Looking at this scene, Haiyuan Ai silently watched the exchange between the two detectives and the expressions on their faces, and couldn't help but raise the corner of his mouth slightly——
"Yoshida-kun, it seems they have solved this incident!"