"So the murderer stayed in the building after finishing the crime and never went out." Ling Ling also joined in the discussion.
"It's possible that he stayed in the building until work time the next morning, and took advantage of the crowd to sneak out among the crowd," Zhou Zhen added.
"So what we are looking for now is an environment that is familiar with Boya Company. Familiar enough to even know that there are three bottles of bleach in their bathroom, but not familiar enough to show up in the company during off hours." Ling Feng concluded. .
"I know!" Ling Ling suddenly shouted excitedly: "It must be the cleaner in the building!"
"During the day, they can appear anywhere without raising suspicion, and the bleach is what they use. They know all the cleaning products in the company. However, if it is after get off work hours, especially at 7 or 8 in the evening, If the dot appears in the company, it will inevitably make people suspicious. No company would ask the cleaners to work overtime, right?"
Ling Feng also felt that her statement made sense, so he looked at Wen Qiao in unison. Wen Qiao was holding his chin and thinking about something. Seeing that everyone was silent, they all looked at him and asked strangely: "Since you think it makes sense, then go investigate and see what I do?"
With the idea of investigation in mind, everyone in the detachment immediately took action. They came to the High-tech Industrial Park again and learned that the sanitation and cleaning work in this area was contracted by the property management company. They quickly contacted the property management company and obtained the list of cleaning personnel responsible for the building where Boya Company was located.
This building has a total of 17 floors. Except for the 17th floor on the top floor, which is unrented, there are more or less people working in the office areas on the 1st to 16th floors. Therefore, there are often people coming and going, and the cleaning work is also stressful. The property company arranged a total of 5 people on duty in turn to be responsible for the cleaning of the public areas of the building.
Ling Feng and the others quickly contacted these five people. The cleaning staff here are all middle-aged women in their forties or fifties. They are not well educated. When asked by the police, they all looked frightened, hemmed and hawed, and were nervous and unable to speak coherently and completely. .
At the end of the questioning, it was found that these five people had alibi that night. They were all at home with their husbands and children. Although he had not yet checked with their family members to verify their testimonies, Ling Feng could clearly feel that these people did not fit the criminal profile just by looking at them. What they are looking for is a man who is thoughtful, strong and capable of throwing people from windows downstairs.
Although it was very common for investigations to be blocked, he still felt a little discouraged. The person seemed to be far and near, seeming to be right next to them, but also seemed to be far away. This feeling of scratching my heart and liver is the most torture.
He suddenly wanted to see what Wen Qiao was doing now? But after looking around, he was nowhere to be seen. But this time, not only was he not dissatisfied with his "laziness", but he was secretly relieved.
In fact, Wen Qiao did not go far. He pushed the door to the stairwell, and sure enough it opened. He stepped in and disappeared into the dark stairway in an instant.
He took out a small, bright flashlight from the inner pocket of his windbreaker and observed the signs around him.
A thin layer of dust accumulated on the inaccessible stairs. It is precisely because of this that the footprints left by those who came here for unknown reasons are clearly visible - there is a set of relatively fresh men's leather shoe footprints on the ground. The footprints are messy, with some directions going upstairs and some going downstairs. On the 14th floor, this group of special-shaped shoe prints were still traceable, and Wen Qiao followed closely to the 13th floor.
He pressed the handle of the exit door with his gloved hand. The door didn't move at all, it was indeed locked.
He did not stop here, but continued walking down until he reached the first floor. He stood in front of the sign at the gate and looked carefully at the three floors that locked the stairwell.
Level 13: Haicheng Information Technology Co., Ltd.
Level 10: Yuanhang Import and Export Trading Co., Ltd., Xingsheng Accounting Firm, Donghai Securities.
Level 6: Changjin Liquor Sales Co., Ltd., Qingcheng Painting Personal Studio, Daystar Law Firm.
Wen Qiao returned to Boya Company to find Ling Feng. “Have employees from other companies in this building visited?”
"Of course, it goes without saying." Ling Feng was a little dissatisfied that he questioned his work.
"What about questioning the cleaners?"
"No useful information was obtained. Although they had the convenience to commit the crime, they had no motive and time to commit the crime, and they had no ability to commit the crime."
"Well, I knew that was the case." Wen Qiao said lightly.
"Hey! You are still making sarcastic remarks at this time. If you had known, you would have asked us to investigate something!" Ling Feng was so angry that his teeth itched.
"If one possibility is eliminated, the remaining possibilities will be greatly increased."
"you mean……"
"The murderer is a person who can enter and exit this building freely. He can appear here openly or disappear quietly among the crowd. Since the cleaners are excluded, it can only be people who work here."
"I walked around downstairs and found that only the stairwells on the 13th, 10th and 6th floors were locked. After the murderer finished his crime on the 15th floor, he went down to a certain floor from the stairwell and entered his company. , so that as long as you wait until you go to work during the day, you won’t arouse anyone’s suspicion. If you were a person who had just completed a murder case, what would you do first after entering your own safe area? "
"Lock the door?" Ling Feng followed his intention and said.
"Unless he is a psychopathic murderer, he will definitely have fear and escape from this kind of thing, and he will inevitably have some self-protective behaviors."
"So you targeted the floors where the stair doors were locked?"
"In fact, you can focus on checking the company on the 13th floor."
"Why is this?"
"There is only one company on the entire 13th floor. This company is not large, with only 12 people, but it rents an entire floor."
"Maybe the boss is very wealthy."
"It is indeed possible, but if you are willing to spend the time arguing with me on investigating the case, maybe the murderer can be found earlier."
Ling Feng was speechless after being defeated by him. "But at the end of the day, physical evidence is still needed to convict this person, isn't it?"
This time, Wen Qiao did not oppose him. "Let the trace inspection people go to the stairwell to extract the footprints. The simplest and most direct method is to first delineate the height and weight of the suspect based on the size, shape and walking posture of the footprints, and then screen out those who meet the requirements. But the stairwell is not where the crime occurred At the scene, these all need to be valid under the premise that my reasoning can be established. Therefore, it can only be used as indirect evidence. I am afraid you will have to spend some time on the interrogation. "
Trace examiner Zhang Haitao is 37 years old this year. His eyes are small but lively. In his words, they are small and focused. Only his small eyes can detect clues that others cannot see.
For those who work in high-rise offices, few take the stairs. As a result, cleaning is much less frequent here, resulting in a noticeable layer of dust in a relatively enclosed space like the stairwell. Zhang Haitao led several of his team members to set up wide footprint lights and carefully observed the traces on the ground inch by inch.
As expected, Zhang Haitao found a set of relatively new shoe prints on the ground, concentrated on the stairs from the 15th to 13th floors. This is a typical standard leather shoe print. The toe is narrow, and there is only a wide border around the forefoot without any patterns. The waist is hunched in the air without touching the ground, followed by the trace of a square heel.
"The length of the shoe print is 29.32 centimeters. According to the regression equation, it can be calculated that the height of the owner of the shoe print should be between 1.75 meters and 1.82 meters. The footprint indentations are unevenly distributed, and there is a virtual edge on the back of the heel. It can be seen that this set of footprints The walking speed is fast, the steps are messy, and there are even many sliding marks, but the footprints are strong, and it is estimated that he is a man around 30 years old."
The scope was greatly reduced. Ling Feng roughly calculated in his mind that among the people who entered and left the building on a daily basis, there were less than fifteen people who matched Zhang Haitao's fingerprint comparison. .
"In addition, there is another special feature about this shoe print, which may help you quickly identify this person." Zhang Haitao finally said to Ling Feng: "This is a pair of leather shoes without patterns, and it is likely to have a full leather sole. This kind of shoe, Especially new shoes that are slippery and difficult to put on. I really don’t know what those internationally renowned designers think.”
"This is probably a worry that ordinary people like us don't have but can't help but worry about." Zhang Haitao patted Ling Feng on the shoulder teasingly. "Even the soles are made of leather. These shoes must be expensive. They are either big brands or hand-made. You might as well look for those rich young men first. Maybe you can identify this criminal suspect in no time. ”
