The building has two entrances, which means that the building actually has two units. Eight floors, each floor is three houses, then one unit is twenty-four houses, and two units are forty-eight houses.

So who is the murderer? I was first of all suspicious of the occupants of these 48 houses. Because if someone from somewhere else were to carry the deceased to this building and push him off the roof, the risk would have been much greater. In such a dense and compact residential area, it is easy to be spotted.

I first conducted a detailed investigation of the staircase of one unit, mainly to see if there were any blood stains on the stairs, because if the body had to be carried to the top floor, the blood stains of the deceased would inevitably remain on the stairs. However, no traces of blood were found on the stairs of one unit.

Similarly, no traces of blood were found on the stairs of the second unit. It seems that the murderer's handling of the bloodstains was quite perfect.

This was followed by an investigation of the rooftop. I found that the door to the rooftop is open for both unit 1 and unit 2, which means that anyone can enter the rooftop.

There is a flower bed on the rooftop, and there are not flowers in it, but vegetables in it. In addition to the flower table, there are also pigeon coops and chicken coops, the pigeon cages are empty, and it is clear that the pigeons have not yet returned home. The chickens in the coop were very quiet, and when I passed by, they did not respond, and it seemed that the chickens had no fear of humans, because they were used to coming and going in front of them.

According to the location of the deceased's fall from the building indicated by the residents, I found the corresponding vertical position on the rooftop.

From this position, I found that there were obvious scratches on the cement guardrail, and the rusty iron railing on the guardrail also left traces of friction.

These abrasions cover a wide area, and I measured the length of the abrasion marks on the concrete guardrail, which is a full one meter six. Similar to a person's height, it means that the deceased was carried by someone lying flat on the guardrail and then pushed off the guardrail.

I believe that the murderer in this place must have been very vigorous in disposing of the body, and it was night, so it is very likely that the blood of the deceased will be left behind, and the murderer will not be able to find out.

Sure enough, on the inside of the guardrail, I found a wipe-like dark brown blood stain. Why is it a swab-like blood stain? That's because in order to prevent the body from bleeding excessively, the murderer wrapped a handkerchief around her head wound, and before pushing the deceased downstairs, the murderer removed the handkerchief wrapped around the deceased's head, and the blood stains on the handkerchief inadvertently touched the guardrail, so the wipe-like blood stains were left.

During the investigation of the entire building, only the rooftop remained valuable clues, but these clues did not prove who killed the deceased and created the illusion of suicide.

But it doesn't matter, the police can carry out an inventory of the entire residential building. Because I believe that the first scene of the murder of the deceased was in these forty-eight houses. The deceased was injured in the head by a sharp weapon, then the blood flow must be not small, even if it is carefully cleaned, there will be blood stains at the scene of the crime, as long as the blood stains are found, the case can be basically solved.

Although the methods are simple, there is still a certain degree of difficulty in the investigation, the first is that some residents do not cooperate, saying that the police search indiscriminately. Of course, Lao Lu also did enough work and applied for search warrants for 48 households in this building. The second is that some households are not at home, and it is impossible to determine whether these households who did not leave their homes after the crime or before the crime. For residents who are not at home, even if the police have a search warrant, it is impossible for the police to break into someone's house and search it. So the only way to do this is to contact the other party by phone and ask them to go home as soon as possible. Of course, there are many people who do not cooperate, especially some people who are working in other places, who refuse to return to their hometowns. And there are some people who can't be contacted at all.

In the end, after a house-to-house investigation, no crime scene was found. However, there were seven households that could not be contacted or refused to return to their hometowns and could not be investigated, so I focused my attention on these seven people.

The police began a more detailed investigation of the seven people.

One of the seven people who aroused my great interest was Ren Huainian, who called 110 the day before the deceased fell from the building, saying that he had lost 66,000 yuan, but he could not be contacted now. So I focused on following up with this person.

I learned from the police that this Ren Huainian was reported to the police on September 21, and I listened to the recording of his police at that time, and he said on the phone: "Hey, my bag was stolen, and it was stolen when I was refueling." The operator asked him where it was stolen, and he said, "Nanbin Road gas station." ”

The police told me that they are still investigating the theft, and as of today, the thief has not been caught.

I asked, "How did his money get stolen?" ”

The police said: "He put the money in a satchel and put the satchel in the co-pilot, and after getting out of the car to refuel, he returned to the car to find that the satchel was missing." ”

I nodded and asked, "Is this money the informant's private money or the public funds of his unit?" ”

The police said: "It's public money." ”

As soon as I heard that it was public funds, I felt that the matter was not so simple, so I asked, "Where does the informant work?" ”

The police said: "It's Wanzhou Kangchun Pharmaceutical Company." ”

Together with Tang Zhenguo, we found Kangchun Pharmaceutical Company in Shenmingba (place name).

After explaining his intention to the person in charge of the company, he began to spit bitter water on us.

The person in charge, surnamed Wu, is the manager of the comprehensive department of Kangchun Pharmaceutical Company, and this manager Wu reported to me: "After Ren Huainian lost his public funds, I was worried that he would have a psychological burden and that it would be dangerous to drive, so I took his car keys and asked him to go home and rest for a few days. But the day after he went home, I couldn't contact him, and I didn't answer my mobile phone landline. I also sent someone to look for him, I was afraid that he would lose his money and couldn't think about it and did something stupid, but when I went to his house, I couldn't find anyone. ”

I asked Manager Wu, "How long has this Ren Huainian been working in the company?" How are people? ”

Manager Wu said: "Ren Huainian has been a driver in the company for two years. This person is very active in his work, has a stable drive, and has a good character. I interviewed him personally when he entered the company, because his parents were both people's teachers, and he had also driven a car for the CEO of the company before, so I appointed him. This year, he was also promoted to drive for our boss. ”

I asked, "What is that $66,000?" ”

Manager Wu said: "The 66,000 yuan is the cost of the new BMW car purchased by our company. The newly bought BMW car was handed over to Ren Huainian to drive, so I asked the finance department to transfer the 66,000 yuan to Ren Huainian's private account and asked him to handle the new car registration. ”

After learning about these situations, I found a very strange question, since the 66,000 yuan was transferred to Ren Huainian's bank card, why did he take out the money when he went to go through the procedures for registering a new car? Can't you swipe your card on a new car, only cash? This is obviously impossible.

But this is just a conjecture, maybe he has his own idea of withdrawing cash? For example, isn't it popular to collect auspicious banknotes now? If he had this hobby and the habit of collecting, he would take out a large sum of money, look for the auspicious banknotes, and exchange them with his ordinary banknotes, which would be understandable.

In order to further understand the truth, I contacted the police who handled the theft case and asked him to take me to the bank where Ren Huainian withdrew the money to see the surveillance video of Ren Huainian withdrawing the money at that time.

From the video, it was indeed seen that Ren Huainian took out the money, and the bank's surveillance video was not only clear, but also had voice. From his conversation with the bank teller, it was learned that the amount he had withdrawn was indeed $66,000.

I paid close attention to Ren Huainian's back, and there was no suspicious stalker behind him. After checking the bank's outdoor surveillance footage, no one was found to be following Ren Huainian. And after Ren Huainian took the money and put it in a black satchel, he walked out of the bank gate and got into the car directly, without going anywhere else on the way. In the video, it can be clearly seen that the satchel was still on him when he got into the car.

Walking out of the bank, Tang Zhenguo suddenly said to me: "Do you suspect that Ren Huainian is guarding himself and stealing public funds?" ”

I looked at the cars outside the bank and said, "That's right." Losing public funds, playing disappeared, and there was a murder in the residential building, which had to make me suspicious. ”

Tang Zhenguo said: "That's easy to do, check his bank account to see if he has saved money after the case?" ”

I smiled and said, "You can do it, but it's not easy." If he were going to save money, do you know what bank he would deposit it in? I don't think even the stupidest person would deposit in the bank where the money was withdrawn before. So it is very difficult to check one bank after another. Also, if he has a certain amount of anti-reconnaissance ability, the 66,000 yuan is not too much, and he will not save it, and you can't find it if you want to. Don't tell me to check the user of the serial number of banknotes, this method is more difficult than looking for a needle in a haystack. ”

Tang Zhenguo listened to my words, was a little frustrated, and laughed at himself: "It seems that I still haven't thought about it comprehensively enough. ”

I comforted, "It's okay, at least you can think of some way to solve it, I'm optimistic about you." ”

Tang Zhenguo's face showed some joy. If people want to progress, they need encouragement and comfort, especially people like Tang Zhenguo, who have a straightforward personality.

After that, together with the police handling the case, we came to the Nanbin Road gas station. Of course, the purpose of coming here is to view the surveillance footage of the day of the theft.

First of all, I walked around the gas station and got a general idea of the location of the gas station.

This gas station is in the middle of Nanbin Road, the geographical location is very remote, except for this gas station, the surrounding area has not been developed.

This strikes me as odd. First, Ren Huainian's Kangchun Pharmaceutical Company is in Shenmingba, and Nanbin Road is obviously opposite to Shenmingba, why did he choose to refuel here? Second, Ren Huainian's family lives in the tannery dormitory on Sharon Road, which is on the opposite side of the Yangtze River. Third, it is the most unreasonable point, he took money from Zhoujiaba, why didn't he go directly to the new car, or refuel at the nearest gas station, but went around most of the city to refuel here? From these three aspects, it turns out that his driving route is abnormal. This has to make me suspect that there is something wrong with it.