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Qiao Zhen's hands kept shaking when she handed a gift bag to her colleague, and the other party gave her a strange look. As a field evidence specialist who has been working for almost two years, this subtle action is indeed a bit outrageous.

She knew very well that the tremors were not due to the fear of the bloody scene, nor from the excessive exercise of the previous day, but from the fact that for the past three hours, her hand muscles had been constantly supporting the weight of her body and various instruments, and the muscles had lost control due to fatigue.

The scene is a typical ring-shaped structure old-fashioned residential house, if it is not led by a colleague, it is likely to be lost in the dim and closed space, some of the street lamps in the aisle have accumulated thick dust, about ten years have not been lit, and some simply have no light bulbs, just like the dilapidated wooden furniture stacked in the aisle, although there is an owner, but no one cares, just here to prove that it once existed. A few listless old men and women sat in the hallway, and when they saw that they did not intend to give way, they looked at them nonchalantly with cloudy eyes, and did not seem to have the slightest enthusiasm for their arrival.

When he stepped into the center, Qiao really had a feeling of sudden enlightenment. The level of renovation inside the house is in stark contrast to the disrepair of the exterior walls of the building outside. The size of the room is not small, it is the most spacious unit in the whole building, the layout of three bedrooms and one living room, the master bedroom is newly painted in elegant light violet, the room is pasted with happy words everywhere, and there are wedding photos of a young couple. The victim was found on a couch in the hall, and the TV channel was stuck on the last channel she had watched before her death.

"The murder weapon was a single-edged knife, found from here." The police who received the report in the early stage introduced them to them, and pointed to the ground in the gap between the sofa and the side table. There was a lot of blood splattered there, as was the wall on the same side of the couch, the couch cover, and the floor nearby.

In the house, three or four police officers from the police station, with standard leather shoes, stood in the middle of the room without any scruples, handing over their work to them. This was originally a reported case in the region, but because it involved a homicide, Qiao Zhen and them needed to go out early in the morning. Qiao Zhen frowned and was silent, and she saw that Shi Yan's face was also a little gloomy. Since the leapfrog development of criminal investigation technology, it is always difficult to avoid the contamination of evidence at the first scene, either because of the lack of training of the police who receive the report, or because the strict protection measures are difficult to achieve. They have never been able to ask these police officers who did not expect the murder to take place in the jurisdiction to wear masks, gloves and foot covers, and answer the police within the specified time, because they are facing the central scene, and just a sneeze of any person can interfere with the entire DNA sampling analysis.

However, in this way, the useful footprints may have already been covered, but fortunately, the police at the scene still had a sense of evidence and put away the murder weapon as soon as possible. Qiao Zhen glanced at it, a very ordinary fruit knife, but a fresh life was buried here.

"The nature of the case can be determined as intentional homicide. We try to preserve fragile evidence first within the limited conditions. "Qiao Rao had just given them a vaccination before sending them into the scene. During the hours they were immersed in taking pictures and collecting evidence, the investigators were not allowed to enter the room, and they happened to be on the periphery to carry out the investigation and visit.

"The deceased was a woman of about 60 years old, her son heard her movement when he got up at 4 a.m. to go to the toilet, the door of the apartment was unlocked, and the window on the other side of the living room was also open, but the offender was not seen." Qiao Zhen remembered the introduction of his colleague. Two years ago, when she was first confronted with a scene that was much messier than this living room, she stood still, not knowing where to start her first shot, and about half a year ago, she began to get used to taking evidence from the periphery and then going back to the center.

However, it also depends on different cases.

Right now, the detectives were whispering outside the door, and Qiao Zhen knew that they wanted to get the clearest possible direction of the investigation so that they could work faster, but there was no way to urge them. Shi Yan was still slowly observing the size and shape of the blood, and at the same time marking it with a small flag, Qiao Zhen had the camera ready, but she couldn't help but be attracted by the wound on the deceased's neck, the one that made her cotton pajamas stained with blood.

Without Shi Yan struggling to say a conclusion, Qiao Zhen could judge that this wound was the fatal wound of the deceased. Her trachea had been severed, and she had ruptured her arteries and died of hemorrhage and shock, but the epidermis of her neck was strangely still intact.

She heard the conversation between Zhang Chenzhi and the deceased's son outside the door, the latter was twice as loud as ordinary people because of his uncontrollable crying, and every word reached their ears clearly, and Qiao Zhen even seemed to be able to see a panicked face.

"I usually sleep well and never wake up in the middle of the night. Yesterday was also strange, I drank too much beer at dinner, and suddenly woke up in the early hours of the morning. ”

"Did you hear anything different when you woke up?"

"I heard the sound of the TV in the living room and thought, I could hear it with the door closed."

"Don't you think it's strange?"

"After my dad died of a heart attack last year, my mom didn't like to sleep in the bedroom, and she often fell asleep watching TV in the hall. We're all used to it, too. ”

"What happened next?"

"I walked into the hall after going to the bathroom, ready to turn off the TV, when I saw my mother half-leaning on the sofa, as if looking at me."

"You didn't turn on the lights?"

"I didn't turn on the lights, I was afraid of waking my wife, she felt that because my mother was watching TV, it would affect our son's study, and it would affect his rest, and she had not been very happy. I didn't turn on the lights, thinking that my mom woke up in a dream and missed my dad again, so I said, 'Don't think about it, go to sleep.'" ”

"What's her reaction?"

The man's speech was very slow, and he didn't seem to be willing to recall: "I heard her call me 'Haohao', and then 'poof' was very heavy and lay down on the sofa again." At that time, my first reaction was that she screamed differently than usual, and the movement of falling down was not like her usual habit, and she did things lightly. I'll go open the lights in the hall right away. ”

"And then I found out that she was injured?"

The other party whimpered, as if trying to restrain the howl that was about to explode: "My mother is gone." When I turned on the light, I saw blood all over the hall, and it was still bleeding from her throat. My mom walked with her eyes open, and she didn't blink an eye. People say that as long as there is an old man in the house, he must go one after another, and I am worried about ......"

"We speak with evidence and law based on the objective situation, and you shouldn't take these nonsense claims to heart. We will do what we have to do, you can rest assured. A brief introduction to your mother's previous life. ”

"She is the director of the hospital's medical office, and she just reached retirement age last year, but the hospital leaders tried their best to keep her, and after my father's incident, she was prone to cranky thoughts and depression at home, so we all persuaded her to continue working."

Qiao Raogang's eyes looked through the burglar-proof window near the corridor, and he habitually looked at his surroundings, as if he was evaluating the personality of this retired and rehired medical worker. The living room was undoubtedly cleaner than any site they had ever visited, with nothing on the coffee table except for a magazine. The glass case in the entrance was filled with books, and not a single ornament was seen. Except for a family portrait of five people hanging side by side on the wall and a black-and-white male posthumous photo.

Qiao Zhen stared at the deceased's white face, her eyes slightly open under a pair of gold-rimmed glasses, as if trying to remember the murderer's face. In the case of the ring-shaped architecture here, it is no different from an elaborate labyrinth, let alone in the early hours of the morning when the sky is dark in winter. The old people in the building account for eighty or ninety percent, the earliest get up at three o'clock, and there are many people who go out to exercise at four o'clock, although the corridor is a cement floor, but basically adults with normal weight walk around, and the vibration and sound can be felt across the three floors. If it is a suspect who is unfamiliar with the environment and enters for the first time, it is absolutely impossible to act rashly without attracting attention, let alone escape from this building smoothly.

So, is the murderer an "acquaintance" who is very familiar with the environment and work and rest in the building, or is it someone who lives in this building or this room at all?