After examination, the man who died at the top plumbing valve was also poisoned, and the toxin and Gao Fei were the same kind.

According to Xu Tian's investigation suggestion, the police completed the investigation of the intercepted residents after a full morning after the early morning, in fact, Xu Tian had already expected that the murderer would not choose to go out, because the police car parked downstairs had exposed everything, so Xu Tian judged that the murderer had a high probability of staying at home and not going out.

Then the first to be investigated is the resident who lives on the same floor as Gao Fei, and at this time, the police officers who have been testing in Gao Fei's home have detected an important clue, there is a floor tile under the sofa of Gao Fei's house that can be removed, and there is a lipstick next to the floor heating pipe under the floor tile, through the detection, in addition to Gao Fei's fingerprint, there is also a fingerprint superimposed on many layers, the shape and texture of the fingerprint are relatively small, and there is still saliva in the lipstick, the police obtained the results through emergency DNA testing, The owner of the lipstick is a woman who lives on the top floor.

Sure enough, the woman was at home, but when Xu Tian and the police knocked on the woman's door, the person who opened the door inside suddenly shocked Xu Tian and them.

This woman Xu Tian and the police have seen it, it is the woman with earplugs in the high-risk boarding house yesterday.

"You again? Why are you at my house again? The woman said in surprise.

"Aren't you surprised to see us? You were in that high-risk boarding house yesterday, why are you here today? Xu Tian asked.

"I've moved! I came here yesterday with the rest of my luggage after you left, and I started dumping things here the other day, and came here last night with my futon. The woman said.

"Why did you only move here yesterday?" Xu Tian asked.

"Because I've been working night shifts these days, someone on this floor was being renovated a few days ago, and I couldn't sleep here during the day, so I came a few days late, is there a problem?" The woman said.

"Now we suspect that you are related to the two murders, and we hope that you will cooperate with the police investigation." The police said.

"Isn't there a mistake? What does it have to do with me again? The woman said in surprise.

"We found a piece of your lipstick in the home of one of the victims, how would you explain that?" The police officer asked.

"Lipstick? I did lose a lipstick, and it was in your hands? The woman said with a questioning look.

"Not in our hands, but in the home of one of the victims, and your lipstick is very hidden, so we suspect that you have something to do with two murders that happened after yesterday morning." The police said.

"You must be mistaken, I lost one lipstick when I moved the day before yesterday, I only have two lipsticks, and the one I lost is still the most expensive, so I remember it very well." The woman argued.

"You said you lost your lipstick? So can you recall roughly what range you lost? Or was it lost in your new home? Xu Tian asked.

"I remember very clearly, because the day before yesterday was a male colleague I liked to help me move, I moved the last luggage the day before yesterday when I was waiting for the elevator on the first floor and used the lost lipstick to make up, and when I got off the elevator and rummaged in my handbag to find the key, I found that the lipstick was lost, and I went back to the elevator to look for it, but there was no lipstick in the elevator at all, and finally I took the elevator back to the first floor, but I didn't find it." The woman said.

Through the suspect's confession, Xu Tian and the police quickly came to the property to check the surveillance video of the day before yesterday, and sure enough, the man who died on the top floor took the woman's lipstick in the elevator, and the man got out of the elevator on the floor of Gao Fei's house, and soon after that, the woman got out of the elevator on the top floor, and then the elevator went down, and when the elevator reached the top floor for the second time, the woman walked into the elevator and looked for something everywhere, and after the search failed, the woman took the elevator down the first floor.

The clue is broken again here, which shows that the lipstick found in Goofy's house has nothing to do with the suspect at all, and the evidence of the dead man stealing the lipstick is still there, which is enough to show that the suspect and Goofy have no connection.

And in order to confirm that the suspect is not related to them, the police have gone through almost all the recent surveillance videos, and they really have not intersected, and the police also found that the man who died on the top floor stole in the elevator more than once, in addition to the lipstick he stole the day before yesterday, he also stole a mobile phone, two wallets, and even a woman's makeup bag, and even the mask used by the girl in the backpack.

"This person is not only a thief, but also a person with special hobbies, so the suspect on the top floor can almost be ruled out, but even so, I still think it's a bit too much of a coincidence, the suspect who was near the scene of the crime yesterday is a suspect today, although she cleared the suspicion, but this is a bit too much of a coincidence." Xu Tian, who returned to the police station, said to Dr. Lin.

"There are a lot of coincidences in this world, but sometimes the coincidences of that special nature can be arranged at all." Dr. Lim said.

"What do you mean? Is it not a coincidence that the woman appeared near the scene of the second crime? Xu Tian asked.

"Maybe! However, this case can be said to be done seamlessly, I have read the police investigation report, and I have not found any clues. Dr. Lim said.

"I also find it strange that the traces of the dead man on the top floor were indeed found in Goofy's house, but no trace of any other person was found at the scene of the death of the man on the top floor, why did the deceased appear in the heating valve?" Xu Tian said suspiciously.

"If you don't find a clue near the heating valve, it means that the deceased is likely not to have been left behind, it is possible that the deceased died in the heating valve, and the murderer only did one thing, close the iron door of the heating valve, it's as simple as that." Dr. Lim said.

"What do you mean...... The deceased may have been manipulating the heating valve? Or is it helping someone on the top floor fix a heating valve or something? Xu Tian asked.

"I think there is zero chance of repairing this matter, I have read the police investigation report, the man who died on the top floor is a habitual thief, and he is a habitual thief with a special hobby, the police have checked the victim's case, since the age of sixteen, the victim has been in and out of the police station for theft, the longest one was sentenced to two years in prison, the victim was in prison when he studied textile technology, and he did not study seriously, and he performed very badly in prison, So such a person who doesn't even look at commutation, do you think he will have the skills to repair plumbing? Dr. Lim said.