Liu Zichen knows Zhuang Cong's situation best, and she is also very sympathetic to this poor and pathetic woman, she first expressed her opinion, "I think it can be confirmed now that the first five cases will not be done by Zhuang Cong, she just did the last one alone." In this case, the previous cases may also be separate, and there may not necessarily be a connection. ”

Shen Mingyue also agreed, "I think what Sister Zichen said is very reasonable, and you suspect Liu Xiaoquan, even if he can kill Tong Minghai and Hou Hong, he will not kill his father Liu Changshou, even if it is a split personality, I don't think it is very reasonable, not to mention that he did not have the conditions to commit the crime that day." ”

Li Yiting thought about it for a while, and also expressed his current attitude, "Zhuang Cong's explanation is reasonable, and the cases of Ding Jiayi and Ji Zuo can be determined independently, but from the evidence currently available, it is still impossible to conclude that there is or is not related to other cases, after all, the murderer's methods and caution are very similar."

"That Liu Xiaoquan is obviously extinguishing the fire on the beach, his mother and the stall owner can testify, when Liu Changshou was shot, so many people saw him in front of him, how could he shoot a crossbow arrow to kill Liu Changshou?" Shen Mingyue still held on to this.

"So he might have a helper, and if it wasn't Nightsong, it might be someone else. Li Yiting refuted the truth.

After listening to everyone's opinions, Xu Jingnan took the initiative to stand up, he said, "In fact, after such a long investigation, I, as a forensic doctor, have done a detailed examination at each death scene. Judging from the evidence and discoveries obtained so far, the circumstances of Ji Zhuo and Ding Jiayi's deaths are obviously different from other cases, and as far as the scene is concerned, the rental house is very simple and there are traces. The murderer left fingerprints and footprints at the scene, which is the only case, so there should be no doubt that Zhuang Cong only made the inference of the last case as the murderer. In the same way, if the first five cases were done by different people, then there would never be no fingerprints or footprints left in each case, and I believe that there are no two or a few different murderers whose style and caution can be surprisingly consistent. Therefore, I think that if the last case is an exception, the other five cases still cannot be separated, and I think it is necessary to continue to investigate them together. ”

Chen Tianyu was always hesitant to speak in everyone's discussion, and then he came to the scene of the previous cases alone. As for what to look for and what to see, there is no clear goal, just hanging out. When he's not confronted with a problem, he's used to fully immerse himself in it, looking for inspiration that touches him in this brainstorming mode.

As Xu Jingnan said, the deaths of Ji Zhuo and Ding Jiayi were caused by Zhuang Cong, and her methods, abilities, and styles are very different from the previous five cases, so there is no need to consider the relationship between this case and other cases. And when those five cases were put together, Chen Tianyu gradually realized that the murderer seemed to have several common characteristics.

First of all, the anti-investigation ability is particularly strong, several cases have been done, there are no witnesses, almost no physical evidence, no fingerprints and footprints at the scene, and no hair and skin, just like no murderer has ever come. But in fact, these cases are all man-made, and the murderer must have been not far away, and even once stood in the position where the deceased was, but he did not leave any clues, and even once made people think that it was impossible for people to do it. This kind of extremely strong anti-reconnaissance ability, I'm afraid not ordinary people can do, he needs careful thinking, clear mind, meticulous analysis and judgment, if not crazy, then must be a high-IQ guy.

The second is that these cases are almost seamlessly designed, every step is indispensable, and where something goes wrong, then it is difficult to achieve the murderer's purpose. But there was no deviation in all the links in the middle, and finally the victim was killed on the spot, and such superb methods and skills of the crime were not arranged by ordinary people.

Another point is that this murderer must have been haunted near the scene of the crime, and he needs to know the location and people very well to be able to arrange it properly. But this person who is in the crowd or around everyone can make people blind and almost hidden, what a strong camouflage ability and how hard psychological quality is required.

Could such a person with superb intelligence, rigorous logic, rich experience, and thoughtful planning be possessed by a mentally handicapped person like Liu Xiaoquan, who has average academics, has no success in his career, and often has a split personality?

Chen Tianyu is very suspicious that Liu Xiaoquan has such an ability, not to mention him, even those people who are still alive in the world around Liu Xiaoquan are almost no people who can have such conditions at the same time. But if you have to think about it, there is a person who meets these conditions better, and he has been excluded from the list of doubters, does it show that this person is scheming and can hide his true body.

This person is Zheng Xing!

After Chen Tianyu returned to the Beiting branch, he told his reasoning, but everyone immediately felt that they could not accept it.

"What?Zheng Xing?" Even Li Yiting was quite surprised, because he and Chen Tianyu had studied this person several times, but they had not found any suspicions about him, so he also felt a little surprised.

Shen Mingyue was surprised and delighted that Chen Tianyu suddenly turned the spearhead away from Liu Xiaoquan, she tried hard to find Zheng Xing's suspicion, but there was still not much convincing, "I am not very familiar with Zheng Xing, he seems to have a good relationship with Liu Xiaoquan, I just heard Xiaoquan say that he is very smart and knows a lot, so Yuan Hui'e asked him to be a tutor for his daughter Liu Xu'er." Zheng Xing has a good relationship with their family, so he shouldn't have done it. But I don't know the relationship between other people and him, could it be that Zheng Xing has a grudge against Tong Minghai and Hou Hong?"

Liu Zichen felt that there was some truth in this proposal, "If you have to find someone who can arrange such a perfect crime scene, Zheng Xing's IQ has become the basic condition, and Liu Xiaoquan really does not have such an ability." But you can't suspect someone because he's smart, good intelligence can't be a reason for committing a crime, and those who kill people are stupid!"

After thinking about it, Li Yiting thought that Chen Tianyu's speculation was reasonable, "The murderer is not necessarily a stupid person, but a stupid person will not create such a perfect homicide case." If we doubt Zheng Xing, then with his ability, he can create some scenes that ordinary people can't do, such as the layout of the vegetable market, and there can't be any slight difference in every step, which must require a particularly smart and cautious person to arrange. ”

"So what is his motive?" Liu Zichen asked a crucial question.

"That's right, anyone who wants to kill someone has enough reasons to support their actions, Zheng Xing has such a good relationship with the Liu family, why would he kill someone from his family?" Shen Mingyue also asked in agreement.

Li Yiting responded, "Maybe in the process of communicating with Liu Xiaoquan and Liu Xu'er, Zheng Xing found out that Liu Changshou had a problem with them, or Liu Xiaoquan led him astray, or maybe Zheng Xing had other plans, such as the rich family property of the Liu family, which may lead people astray." Don't forget, Zheng Xing finally resigned and came to Liu's house to be a full-time teacher for Liu Xu'er, a big reason is that Yuan Hui'e offered a salary several times more than when Zheng Xing worked in the company, which shows that he cares about money very much, and he may covet much more family property than salary. ”

It sounds like there is some truth in this statement, but it is still too reluctant, Li Yiting only found a possible place, and did not identify any evidence that can prove that Zheng Xing has this motive. Therefore, the discussion did not lead to a clear result. Just like Liu Zichen said, don't doubt Zheng Xing just because he has the ability to carry out such a complicated case, being smart is not a crime, you must find a real motive, a real purpose, and clear evidence to make such a conclusion.

Chen Tianyu proposed that in order to inquire about Zheng Xing's motive for committing the crime, the existing evidence must be insufficient, and the only way to do this is to conduct a more in-depth and detailed investigation again, and the first investigation is to conduct a secret investigation of where he lives. Generally speaking, the residence of any criminal will provide a place for the investigator to refer to or suspect, and everything in the house can be used by an experienced detective to analyze the personality and habits of his owner, thus helping to find valuable clues.

Of course, since it is a secret investigation, you can't startle the snake, and you can't let the owner of the house, that is, Zheng Xing, know that you are being targeted and searched, which will have the opposite effect, and you must take the way of diverting the tiger from the mountain to let Zheng Xing leave his house and stay outside for a while.

This needs a suitable reason, for Liu Xiaoquan's problem, Chen Tianyu had talked enough with Zheng Xing last time, and Zheng Xing also said his opinion unreservedly, and there seemed to be no other things to ask him over, and the members of Beiting were not very familiar with this person. The only people they can think of who are familiar with Zheng Xing are Liu Xu'er and Liu Xiaoquan, Liu Xiaoquan is mentally abnormal now, and he definitely can't communicate normally, and like Ji Jing, although he knows Zheng Xing, he is not familiar with it, and Ji Jing has just suffered continuous blows, and he can't cooperate, so he can only ask Liu Xu'er to help him again.

Liu Zichen, who was the closest to Liu Xu'er, went out again and asked Liu Xu'er to invite Zheng Xing to his house in the name of schoolwork. For the sake of safety, Liu Zichen and Shen Mingyue also accompanied Yuan Hui'e and took care of them at Liu's house.

Liu Zichen was worried that Zheng Xing would not be willing to go, but Li Yiting analyzed from Zheng Xing's point of view that if he wanted to behave normally, he would definitely be invited. Because Liu Changshou died and Liu Xiaoquan had an accident again, as Liu Xiaoquan's friend and Liu Xu'er's tutor, he should take care of his poor mother and daughter, so he will definitely not refuse Liu Xu'er, thus showing that he has a ghost in his heart.

Sure enough, after Liu Xu'er contacted her, Zheng Xing readily agreed. Liu Zichen and Shen Mingyue went to Liu's house according to the plan, and Chen Tianyu took Li Yiting, Xu Jingnan and Kuangsuo to secretly sneak into the house where Zheng Xing lived.

Zheng Xing lives alone in an ordinary bachelor apartment in the city, and this house is not owned by him, but rented. With his status and income, it seems that he should not just rent such a small house, he should be fully capable of buying a new house. And after entering the house, the situation inside is also beyond everyone's expectations, this is an extremely simple decoration and looks a little shabby in the apartment. The floor is concrete, no floor tiles or wooden planks have been laid, the walls have only been painted, some places have been pasted with pale wallpaper, and the roof has not been treated. The whole house looks particularly simple and elegant, and there is almost no investment in decoration, but there are a lot of furnishings.

In the living room, where the sofa should be displayed, there is a piano, and when you touch it, there is not a trace of dust, and its owner often plays and cleans up. There are also a lot of musical instruments hanging on the wall, including erhu, guzheng, pipa, harmonica, etc., and the living room has almost become a small musical instrument exhibition hall, which shows that Zheng Xing has a deep attainment in music.

When you open the door, you can immediately smell the fragrance because of the many flower pots placed in front of the floor-to-ceiling windows in the room. There are more than a dozen planters such as moonflowers, chrysanthemums, spider plants, carnations, and thorny things like cacti, all of which are bathed in the sun by the bedside, and together they exude a refreshing fragrance, making people feel as comfortable in the house as if they were in a flower garden.

The room was furnished with a single bed, a cabinet full of books, and a writing desk. The books on the top of the cabinet have been roughly flipped over, there are many professional books in different categories such as psychology, history, sociology, law, etc., and most of them are old, and even have handwriting, it can be seen that Zheng Xing often reads books at home, and can be described as well-read and quite serious. There are brushes, inkstones, and a few written but undried brush words on the writing desk, which I think are Zheng Xing's creations in his spare time, and it really has a bit of charm in it. In addition, on the edge of the table, there are two boxes of black and white chess pieces, and next to them there are chess games for research purposes.

From Zheng Xing's house, Chen Tianyu and the others did not find any valuable clues, and there was nothing that could be linked to the case. But they can also see that this high-achieving student is indeed worthy of his reputation, the house is simple but tasteful, and he is proficient in piano, chess, calligraphy and painting. He lives alone, but his life is colorful, and his interests and hobbies are all over a variety of industries and categories, and he is obviously a literary young man. He pursues his dreams, even if he earns a lot of money, he is not drunk with money, and he has not relaxed his requirements for himself, he is still working hard and persistently. Such a person is indeed too perfect, so perfect that there is no flaw. However, no one is perfect, does he really have no weaknesses?