As soon as I landed on the ground, my grandfather exchanged a look with the beard. My father said that I can't let go of any detail, because the truth is often hidden in the details, so I developed the habit of silent observation when I was a child, and I didn't want to escape my eyes for any small movements.

I didn't expect the test to come, but I'm not bragging, I'm really confident.

"I want to see the autopsy report, and the transcripts of the people who were there." I said immediately.

"That's not in a hurry, it's a little bit of a favor and needs your help. By the way, I haven't introduced myself yet, my surname is Nie. Officer Nie got up, took the briefcase and said to me. You'll find out if you come with me. ”

Grandpa must have told him a long time ago, and I didn't talk nonsense, so I said that Uncle Nie would lead the way.

On the way to the police station in his police car, he briefly introduced that his full name was Nie Lang and he was my father's partner before his death. In addition to the official duties of the police department, he just went to my dad to help, and of course my dad also helped him solve many police cases.

Now he is the captain of the criminal investigation team, and he has been telling me all the way that he is stained with his father's light.

When I arrived at the police station, he took me to his office alone, explained the case to me in detail, and showed me all the files related to the case. On the day of the case, six people, including the deceased, four men and two women. One of the women was in a romantic relationship with the deceased.

The other woman was the deceased's best friend, and the other three men, one was the deceased's childhood friend, and the other two were colleagues.

"According to our investigation, the deceased's friend actually knew the deceased's girlfriend in front of the deceased and had a crush on her." Nie Lang said to me.

I looked up, looked at him and asked, "You mean to say that because of feelings, he moved to kill." ”

"Judging from the investigation of the relationship between everyone present and the deceased, only this person had a motive to kill." Nie Lang told me very clearly, "And it is very sufficient, the deceased quarreled with him because of this woman before his death, and even used his hands." ”

I put down the file in my hand and asked, "In that case, why did you let me come?" Wouldn't it be nice to know who the murderer is and find evidence? ”

Nie Lang silently lit a cigarette, took a hard puff, and then looked at me and said: "The problem is here, he is the most suspected, but we don't have any evidence, the testimony of the five people is the same, during the banquet, no one has left, except for the beginning of the mutual circulation of menus, the six people did not have any physical contact." ”

"And the autopsy report of the deceased is also very clear, and the time of the deceased's poisoning is indeed during the meal."

"So, how did the deceased get poisoned? What kind of poison was there, and have the dishes, chopsticks, and cups used by the deceased been tested? I asked.

Nie Lang nodded and told me, "The test has been done, and the poison in the deceased is potassium cyanide." But only potassium cyanide was detected in the cup. Even the menu has been tested, and there is no trace of potassium cyanide. ”

The three words potassium cyanide seemed to be electric in my heart, and my intuition told me that the key was that the poison was potassium cyanide. This thing is very powerful, just contact with the wound, or inhalation of a small amount can kill you.

I confirmed with Nie Lang again that the six of them didn't even pour alcohol into each other during the banquet, and it was really difficult to find out how the murderer poisoned. I asked to take a look at them, and Nie Lang agreed, saying that it was not difficult.

After taking me to sneak a peek at the five people in the detention center, I had the answer in my heart.

"How? Can you solve the case? Back in the office, Nie Lang lit a cigarette again and asked me if I wanted it.

I shook my head in refusal, turned around and sat down in a chair, looked at him and asked seriously, "Uncle Nie, you said that if I solved this case, I won't be held responsible, haven't you forgotten?" ”

"Of course I won't forget, and I'll remember you for a favor." Nie Lang replied, immediately sat up, and asked me, "Do you already have an answer?" ”

"Answer me first, did no one leave the table before these five people were arrested?" I asked again.

"Yes, after the murder, the restaurant staff were also very scared, and they were detained, and they were not even allowed to go to the toilet." Nie Lang replied in the affirmative, "Until the police arrive and take them back to detention." ”

"It's very simple, you only need to check the fingernails of four of them for traces of potassium cyanide to know who the murderer is." I told him with confidence.

Nie Lang looked at me suspiciously and asked why, and I told him that during the banquet, they had no contact except for circulating menus. In other words, the murderer poisoned only when the menu was circulated. Potassium cyanide is a white spherical lump, but it is easily soluble in water and hydrolyzes quickly, as long as it is thrown into wine, it will dissolve quickly.

If you put it in the menu, you still risk being seen when it slips, and the only way to do it is to hide it in the nail cap and subtly bounce into the wine glass under the cover of the menu. This way, there are no traces on the menu, and it is easy to overlook the point of circulating the menu.

Nie Lang suddenly realized, I asked him to take me to see the five people, just to see if their fingernail length could do this. So exclude a person with ultra-short nails.

I'm not entirely sure, but I can't think of any other way than that. Nie Lang then went to arrange the test and sent me home first, saying that if there was a result, he would come and notify me.

Three days, three full days of waiting, I almost thought I had guessed wrong, and I was restless. Grandpa was very calm and didn't ask me about the case.

But three days later, Nie Lang really came, with a happy face, and told me that my guess was right. The murderer did poison like that, but the murderer was not a friend of the deceased, but a lover of the deceased. The reason was that the deceased was violent and threatened her with her fruit photos not to report to the police.

This woman had murderous intentions, and deliberately provoked him to fight with his friend, so that the police would focus on his friend. I pretend to be a good girl, and I just perform well.

Nie Lang praised me for having no dog son and having the demeanor of my father. I was almost so happy that I couldn't find the north, but my grandfather poured cold water on me at this time and told me to finish my work.

It turned out that the restaurant where the deceased died, has been going bad in recent days, and there are always a lot of strange things happening, and the customers are scared away, saying that it is haunted. Grandpa's meaning is to let me do this well, Nie Lang is cheering on the side, and I can't agree to it.

I also learned a lot in the Nine Tricks of Deaf Ghosts, and the deceased's behavior was actually unwilling. But I don't want to do it at all, because if the dead are too angry, I guess I'll have to hang there.

But the result was better than I thought, I brought the rooster blood, incense paper and grandpa to the restaurant, and grandpa went upstairs to drink tea. However, after I burned incense and paper, although the deceased also began to make a fuss, moving tables and chairs, etc., under my persuasion, he left with peace of mind, and the rooster blood did not come in handy.