Judging from the clues that have been investigated, the murderer this time should have something to do with several geology researchers who temporarily joined the mountaineering team back then.

But the psychological portrait drawn by Ding Fan before seemed to be a little different from the murderer in this investigation.

Generally speaking, this kind of performative personality is usually not very old, that is, in his twenties, at best, not more than thirty years old, and people at this age may have a little heresy in personality.

After killing, there is a certain performative impulse, and killing people and placing corpses are both performative impulses, a kind of psychological catharsis and desire to perform.

But since Ding Fan met Lin Ziming, the clues he got showed that the murderer this time did not seem to be a young man, but more like a person in his forties and fifties who committed the crime.

Now re-analyzing the previous cases, it seems that it is really not a young man who committed the crime, but a middle-aged man who is completing a case.

Coupled with the figure that Ding Fan tracked from Lu Dahe's house at that time, it didn't look like a young man from the back.

Judging from the body shape, tone and voice of the man in black I saw at that time, this person should be around fifty years old, and his physical fitness is very average, but he should know very well about the urban planning and construction of Jin'an City.

The winding path turns very clearly, and it seems that I should know this section very well before.

For these things, Ding Fan has to make a new record and make a new mental portrait of the previous one.

It's just that there are too many detailed things, and Ding Fan has been busy all night, and he only drew a general shape.

The rest of the things, it seems that some detailed data is still needed, after all, psychological portraits sometimes do lack some accuracy, which even those professional psychologists abroad may not be able to grasp 100% of the time.

Early the next morning, Ding Fan came to the office early, and he didn't sleep all night, thinking about the man in black he tracked yesterday.

Although his fingerprints and blood samples have been left at Lu Dahe's home, these two things do not fully prove his identity.

At least the samples and comparisons have been done on those prisoners with criminal records, and no match has been found at all, and it is definitely not easy to fish out this needle in the sea now.

After thinking about it all night, I didn't fall asleep, and finally simply went back to the office, anyway, I didn't attend the meeting yesterday, and Meng Huan prepared a detailed meeting record for him, just hold it in his hand and look at it, maybe it can help a little.

Unexpectedly, at this time, he actually received a call from Liu Jian.

During this time, Ding Fan had been busy with the things at hand, and he forgot to ask him how he was doing, and he didn't expect him to remember to call himself.

After Ding Fan's inquiry, I learned that the reason why Liu Jian called him was because Meng Huan had contacted him before, saying that he needed his help to find the list of missing persons from the Institute of Geology, especially more than ten years ago, which scientific research team had settled here at the time related to that mountaineering team.

If you want to say something else, Liu Jian may not have a way, but if you want to find someone to come out, he still has some ability in this regard, and I don't know what investigation he did.

The investigation team of that year was formed by the Geological Bureau of Jin'an, and most of the people in the whole team were locals of Jin'an City, and the only outsider was a girl named Chen Jiaqi, who was separated after graduating from college, and her hometown was Yanjing.

I heard Lin Ziming say before that there was indeed a woman in the middle of this team, and in the end, she did not escape from the clutches of the devil, she was thrown into the cold wind, and after a night, she was frozen to death.

In addition to the investigation list, Liu Jian also checked the family situation of these people by the way.

Although there are some elderly people in the homes of several victims, the old people in these families are not young, and the youngest one just passed away last year.

In other words, at the beginning, Ding Fan suspected that it was the family of these scientific researchers who wanted to avenge their families, which was obviously a bit unreasonable.

The immediate family members are no longer alive, and even if they are still alive now, it is obviously impossible for these old people to come out and kill people.

Originally, Ding Fan gave up this clue a little, who knew that Liu Jian's stinky problem really hadn't changed at all, although Chen Jiaqi's parents were no longer there, but when she first came to Jin'an, she didn't come alone, when she was at school, this Chen Jiaqi had a boyfriend, and the two were ready to get married.

It's just that the Geological Bureau temporarily came down to the task, and Chen Jiaqi was one of the members of the exploration team this time, and he was also the only technician in the entire team at that time, so the marriage between the two was postponed for a while.

A few days before the departure of the mountaineering team, Chen Jiaqi's boyfriend went abroad, saying that his family arranged for him to study abroad, and it happened that his wedding date was postponed by a year, so he was asked to study abroad for a year first, and the wedding was held in return during the summer vacation.

In this way, there is no delay on both sides, and it is said that the man's family is also good, but I didn't expect that when the man came back from abroad, he got bad news.

These are all things that Liu Jian spent a night, using all his connections and investigating.

After following Ding Fan for so long, he was still able to find out the key investigation points, along with Chen Jiaqi's fiancé's name.

If it weren't for Liu Jian's help this time, Ding Fan would have needed at least two days to find this person named Hu Tian.

With this clue, it is much easier to continue the investigation, at least with a targeted investigation direction, it is relatively easy to find out this person.

In one morning, the police station, together with the assistance of the public security brigade, and the surrounding police, quickly surrounded Hu Tian's residence.

As long as this kid is in the room now, this time he has no way to enter the heavens and the earth.

Meng Huan personally led the team to arrest people, Ding Fan actually didn't want to come over at all, but he was a little worried.

If Liu Jian's news came yesterday, Ding Fan wouldn't have been so worried, but after his chase with the man in black yesterday, it's been a night, and God knows if he will stay here?

At least in Ding Fan's opinion, this murderer himself has a certain anti-reconnaissance ability, judging from his layout of the crime scene and cleaning up every detail, this person will not be so careless.

In fact, it was really similar to what Ding Fan thought, Meng Huan led people to rush in directly from the main entrance, only to find that there was no one in the room at all.

Judging from the traces of the scene, there were indeed people living here before, and in this small tin house, at least some people have lived here for at least a month, and the instant noodle box discarded in the corner is more than one person high.

There was also a bitten apple on the table, the tooth marks on it were clearly visible, and it didn't look like there were any signs of decay for the time being.

Judging by the current temperature, this apple should have been bitten yesterday, but the apple was not eaten and the person had already left in a hurry.

Ding Fan came in from outside, glanced at the room briefly, reached out and picked up the apple on the table, smelled the smell on it, and grabbed the trash can on the ground and turned it inside.

"It should have just left, if I guessed correctly, he should be injured!" Ding Fan put down the paper basket in his hand, walked around the room, frowned and said: "A few hours ago, the person had already run away, and now it's too late to chase him, but as long as he is still in Jin'an City, I don't believe that he can go to heaven, report to all the police stations, go down to the community, send Hu Tian's photo to all the community directors, and find out the person for me within three hours!"

Three holes of cunning rabbits!

This Hu Tian is really worthy of being a highly educated person, and he must have prepared a lot of footholds on Jin'an's side.

This is just one of them, and it was found that it had been here for a long time.

He also knew that Ding Fan saw someone yesterday, and this foothold was no longer safe, so he dealt with his injuries and left as soon as possible.

Now I'm trying to catch him out, I'm afraid it's really not easy, the community may be able to help a little, he shouldn't dare to live in the regular community, the only place he can hide is only some old towns, plus the kind of privately opened black hotels may be able to tell him to settle down.

This, with the help of the security brigade, should be able to make an investigation quickly.

It's just that in this way, I'm afraid that a lot of time will be wasted, after all, the population of Jin'an City itself is also quite large, and the difficulty of finding someone to come out can be imagined.

"Master, look at this!"

After Meng Huan searched around the house, he came out with a rope in his hand and a bloody knife and sent it directly to Ding Fan.

Ding Fan had seen this kind of small blade before, a kind of scalpel commonly used by Qin Lu, when dissecting corpses, the effect of this knife was very good, but this thing was rarely sold outside.

The rope is simple, and all the corpses before were left with ropes of this material, which was a kind of mountaineering rope used back then.

"It should be a crime tool, find the fingerprints in the room and bring it back for comparison!"

After seeing these things, Ding Fan didn't stay in the room, and hurriedly rushed out of the door, calling out with the phone in his hand.

Meng Huan looked at Ding Fan's back, and she didn't know what he was going to do for a while, but her trust in the master was basically deep-rooted, as long as it was what the master did, she thought it was right.

As for the other people around her, I'm afraid they don't think so, at least Yu Yang, her captor, looks at Ding Fan a little unpleasantly.

"Captain, this Director Ding, isn't it a bit vain!" Yu Yang stood beside Meng Huan, and said in a sour tone: "The fat man under his command before had a big brag, saying how good their team was, but whenever he took over the case, it didn't take more than a week to close the case, but how long has he been involved in this case?

Meng Huan knew that Yu Yang had been under a lot of pressure recently because of the case, but everyone had pressure, not only he was under pressure, but Meng Huan also didn't allow anyone to say that Ding Fan was not.

So after hearing this, Meng Huan's face suddenly became very ugly, and he glared at Yu Yang fiercely and said, "He is my master, when he did, you were still eating in the cafeteria at the police academy!"