Qiao Chuan's thoughts went back to two years ago.

In 2012, a scaffolding collapse accident at a construction site in the urban area, three dead and two injured, I thought it was just an ordinary safety liability accident, but because of a sentence from the professor of structural mechanics of the Provincial University of Architecture and Architecture changed the direction of the detection of the neat case, so as to find out that the technician of the construction site deliberately changed the scaffolding structure, although the average person can not see how this change will affect the overall structure, but Professor Liu Jianguo of the Provincial University of Architecture and Construction only saw the reason through the photos in the newspaper, This case was transformed from an ordinary safety liability accident into an intentional homicide case.

"Professor Liu, meet again."

Liu Jianguo looked at this familiar face, resolute and energetic eyes, a hand stretched out, with green tendons bursting on it, he couldn't think of who this person was for a while, but he still stretched out his hand and shook it twice, by the way, he recalled who this person was.

"Officer Joe?" Only then did Liu Jianguo remember the case from two years ago.

As a university professor, also an engineer and designer specializing in structures, everyone will be skeptical of his report two years ago, only Qiao Chuan listened to his understanding of the case, so as to solve the case.

"Hehehe." Qiao Chuan laughed a few times, "Professor Liu, it was thanks to you back then, otherwise the criminals of the year probably wouldn't have shown up now." ”

"I still thank Officer Joe for your trust." As a scholar, Professor Liu has always maintained a rigorous attitude, and he also went through a series of calculations to deduce the scaffolding collapse incident through 3D modeling.

"Yo, Huzi is also there." Huzi heard Qiao Chuan call it, and it was originally a little nervous and kept wagging its tail at Qiao Chuan, allowing Qiao Chuan to ravage his head.

Qiao Chuan, who was still smiling on his face, suddenly tightened his face,

"Professor Liu, as the informant, there are still some procedural things that I hope you will cooperate with."

Seeing Professor Liu nodding, Qiao Chuan continued,

"Xiaocao, you record it."

After a brief inquiry, Qiao Chuan roughly knew the process of Liu Jianguo's discovery of the victim, and at this moment, a young police officer ran behind him.

"Team Qiao, Forensic Doctor Chen, they're here."

Qiao Chuan's brows furrowed slightly, and then he said to Liu Jianguo:

"Professor Liu, thank you for your cooperation, there may be some things to trouble you in the future."

"Fully cooperate with the work of the police department."

After sending Professor Liu away, Qiao Chuan came to the scene of the crime.

"What are you talking about? Don't you know that the first thing you want to do here is to check out the scene? When can't an enquiry be made? ”

Qiao Chuan put on his gloves while perfunctorily putting on this cold face, "I met an acquaintance, an acquaintance." ”

It was Forensic Doctor Chen who talked to Qiao Chuan, Chen Ru is the only female forensic doctor in the city, and she is also a primary school sister in Qiao Chuan's police academy.

In the police force, there is naturally no shortage of suitors for a beauty like her, but since she once "beaten" a suitor, no one dares to chase her or give her a blind date.

Chen Ru didn't take Qiao Chuan's words,

"The deceased was about 20 years old and had purple strangulation marks on his neck." Chen Ru then poked the surface of the strangulation marks with his fingers, "The surface of the strangulation marks is smooth, unclosed and semi-circular, it should be rubber or metal rope, and the strangulation marks are caused before death, not intentionally caused after death." ”

Qiao Chuan understood the meaning of this sentence very well, because there was a case in the past that was related to the strangulation after death.

"The deceased's tongue protruded from his teeth, and the deceased suffered a fatal injury due to mechanical asphyxiation."

Chen Ru motioned for Qiao Chuan to lift the deceased's buttocks, Qiao Chuan cooperated with a forensic doctor to lift the body slightly, and Chen Ru then lifted the deceased's skirt.

"Strange." Chen Ru looked at the deceased's buttocks, and Qiao Chuan couldn't help but lean in.

"What is this?" Qiao Chuan saw that there was a mist of corpse spots on the deceased's buttocks, which was not difficult to explain, because the deceased's posture was lying down, but there were still a small number of corpse spots on the side of the buttocks, although the color was not dark, it could still be seen vaguely.

"The deceased was moved after death." As soon as Chen Ru finished saying this, someone shouted Qiao Chuan not far away.

Qiao Chuan got up and looked over, he was a police officer in charge of trace reconnaissance.

"Team Qiao, I found a small satchel over there, which contained an ID card, which should be the deceased."

Qiao Chuan nodded and asked Chen Ru's opinion with his eyes.

"The specific time of death still needs to be determined by autopsy, but after the pressure of the corpse spots, the temperature of the corpse, and the degree of stiffness of the corpse, the approximate time of death should be between seven and twelve o'clock last night."

Qiao Chuan nodded and recognized Chen Ru's appraisal results.

Qiao Chuan followed the police officer in charge of trace reconnaissance to a place on the riverbank.

"What's in the bag?" Qiao Chuan asked as he watched the people in the technical room put the contents of the bag into the sealed bag.

"I have an ID card, a bank card, cash, keys or something, and a mobile phone."

The cash is still there, it doesn't seem to be for money, Qiao Chuan said secretly, as far as the current situation is concerned, the situation at the scene shows that this is probably an impromptu murder, after the situation of making money is abandoned, the rest is not difficult to think, Qiao Chuan looked from a distance, and saw Chen Ru carrying the autopsy box into the car, and the autopsy depends on you.

"Team Joe, look at this."

Qiao Chuan's thoughts were quickly caught back, and he looked at the hand of a police officer in the technical room, and couldn't help but squat down when he looked at the marks on the ground.

In the vicinity of the discovery bag, this grass seems to be very messy, different from other places, although there is grass here, it seems to be very thin, it seems that the surrounding people often walk this road, so that you can see the loess below, although it rained the day before, but the impact on this trace is not great, especially two of them are obvious, this is the shoe scar, because just now I saw the corpse, Qiao Chuan easily guessed that this is caused by the high heels on the deceased's feet, it seems that this should be the first scene.

But there was a question that suddenly turned in Qiao Chuan's brain, so why did corpse spots still appear on the side of the corpse, during the period of time when the corpse spots were formed, did the murderer still stay in this place, and then moved to another place. In addition, if someone is strangled to death with a rope, there will be no posture of lying on his side, and judging from the strangulation marks just now, it is obvious that the strangulation marks at the throat position are relatively deep, could the murderer still pose for the victim?

Thinking of this, Qiao Chuan found another strange place on the ground, and on top of these two traces, there was another trace, a very deep trace, which made Qiao Chuan think for a long time.

"What is this?" The police officer in the technical room didn't know if Team Qiao was asking or talking to himself, and didn't dare to answer him.

A "abundance" that is missing, what is this word? Looking at the traces, this should be the most recent, is this word a reminder left by the deceased to the police that he knows who this person is?

After watching these two scenes, Qiao Feng was still confused about the murderer's behavior. According to Qiao Chuan's inference, the time of this case should not be earlier than ten o'clock in the evening of the previous day, because it is adjacent to two universities, and the time when the door of the university dormitory is locked at ten o'clock in the evening, if the couple chooses to open the room at night, this is not the road through the hotel, since there have been no other police calls from last night to this morning, so the murderer will definitely be selected after ten o'clock in the evening when there are few people.

Yesterday it began to rain lightly at half past nine in the place where I lived, and according to the direction of the wind yesterday, it should rain here after half past nine. On the other hand, a young woman would not have gone to this inaccessible place for no reason, and since she had been contracted, it was very unlikely that the deceased would later be left alone here. Someone who knew the deceased? Thinking of this, I couldn't help frowning, and at this moment, the police officer in the technical room came over again and said a strange message, and a clear fingerprint was found on the pole of the surveillance camera nearby.

A clear fingerprint? What makes the people in the technical room feel that it is clear, when they look at the pole, Qiao Chuan knows why they say that it is clear, this fingerprint does not need medicine to make it appear at all, it can be found with the naked eye alone, just like someone applied ink to his finger and pressed it on this white pole.

But Qiao Feng felt very strange, if this was the murderer's, how could the murderer leave his fingerprints here so carelessly.