And at this time, there was a new discovery by Yang Qi.

This clue made the key details clear, but it also made the whole case confusing.

It's like a person who had been diving under the ice to find an exit, but when he climbed ashore, he found that the shore was full of fog and he still couldn't tell the direction.

A standard 90-degree insertion of a knife, a wound of almost the same depth up and down, if it is impossible to do it artificially, then is it possible that the knife is indeed pierced without someone else's hand?

"The knife was bought by Zhang Meina herself?" Cheng Ting tilted his head in deep confusion and thought. "She has knives in the kitchen at home, so why should she buy a knife?

Tang Yunzhen suddenly understood why he couldn't draw the appearance of the suspect all the time.

While watching the monitoring playback, he compared the various simulations made by Xing Ye, and finally spoke after a long time. "We overlooked one thing at the beginning, the most perfect secret room is actually suicide. ”

"But if she committed suicide, how could she stab the knife ninety degrees into her back?" Cheng Fengqian asked while trying to force his arm backwards, he is a professionally trained police officer, his physical fitness is better than that of ordinary people, and he can't reach the required position, not to mention that Zhang Meina is just a college student who has been in the laboratory for a long time and is extremely inactive, and her physical flexibility may be worse than that of other peers. "I asked Zou Chuanjin about insurance, and he said that it was because Zhang Meina had a small accident in their laboratory two years ago, and several students involved were more or less injured, and Zhang Meina was hospitalized for a few days, and she was more likely to get sick than ordinary people for most of the year, and often had to go to the hospital, so Zou Chuanjin bought Zhang Meina universal insurance based on medical subsidies. ”

"When did you buy it?" Tang Yunzhen flipped through the information in his hand during the process. "From the date of the effective date of the insurance, it has been enough for two years, and even if you commit suicide, you can still get the insurance money. Then why, Zhang Meina deliberately disguised suicide as homicide?"

The answer to this question can only be asked by herself, and there is no way to extract it from the evidence. Zhou Yanfei didn't know when he was already standing behind Tang Yunzhen, resting his chin on his shoulder, treating him like a bookshelf and directing the other party to flip through the information to her. "What we have to do now is to confirm whether Zhang Meina committed suicide or not. ”

"Feifei, when did you come?" Cheng Tingshen was too focused just now, and he didn't notice at all that when the few of them formed a circle for a meeting, Zhou Yanfei was already watching in the back circle. "It's only been five or six hours since you got home in the afternoon, have you slept enough?"

"Of course not, but people are afraid of being alone at home in the middle of the night, so I'm coming back to you. Zhou Yanfei talked to Cheng Tingshen, and she always seemed to be her father's coquettish daughter, but to Tang Yunzhen, she was not so cute and cute, and she raised her hand and pinched his arm. "Slow down, I haven't finished reading it yet. ”

"Then sit down and take your time. Tang Yunzhen was not surprised at Zhou Yanfei's 'falling from the sky', and personally moved a chair for Zhou Yanfei, invited her to sit down, and respectfully held the document in front of her. "Mother's Door!"

"What are you two acting in, what are you playing?" Although Cheng Tingshen was not surprised, he also knew that Zhou Yanfei had a smart mind and a unique way of thinking, and he could always notice what they overlooked, but he still couldn't help asking. "Feifei, how did you come up with the idea of looking at the surveillance of the convenience store near Newport University?"

"I wasn't sure if it was useful, but I just saw that you were at a loss, so I asked Yang Qi and them to help take a look, but I didn't expect there to be a clue. After Zhou Yanfei came back, she had already gone to the technical room first, and then came to the criminal investigation detachment, she had been reading the information carefully, but at this time she suddenly raised her head and smiled at Tang Yunzhen. "Thank you so much for Don's tips. ”

"Me?" Tang Yunzhen didn't understand for the first time, thought about it carefully, and suddenly his face turned pale. "That...... Is it too late to admit your mistake?"

"I've been caught five times, is it too late for you to admit your mistakes?" Zhou Yanfei didn't raise his head and continued to read the information. "It's only useful to deal with you, a repeat offender, and the fifth time, then according to the number we said before, the fine will be increased by five times. ”

Cheng Fengqian, Xing Ye, and Zuo Quan were all confused, and only Cheng Tingshen finally understood. "Old Tang, are you buying cigarettes again?"

Cheng Fengqian also reacted, and hurriedly waved his hand towards Tang Yunzhen. "Team Tang, I'...... I didn't tell anyone. ”

"I know. Of course Tang Yunzhen would not suspect that Cheng Fengqian reported him, from yesterday to now, Cheng Fengqian should not have had a chance to see Zhou Yanfei, even if he did, he would not tell him for no reason.

He must have planted it in his own hands, he seems to have gone home yesterday to take a shower and change his clothes, and he was in a hurry to go back to the police station, so he forgot to take out his cigarette. "That...... Chartered wife, how can you rummage through other people......'s clothes? What if you flip through something more private!"

"Who's rummaging through your clothes? You're all in the dirty basket, and I scooped through my pockets before I threw them in the washing machine, and thank you for the pack of cigarettes and the receipt for the cigarettes." Zhou Yanfei has always been sensitive to physical evidence, and when he sees the receipt, he will habitually read the content carefully, and found that it is a convenience store next to Xingang University, so he thought of asking Yang Qi to check the monitoring.

The campus of Xingang University covers a large area, and there are many large supermarkets and convenience stores of chain brands around, and there are even more private stores without brands, and they cannot determine the specific time of buying knives, so there are a lot of surveillance videos on the day of the crime.

Originally, it was a very big project, but probably because Yang Qi had been with Zhou Yanfei for a long time, luck followed her, the goddess of luck, and when he had only been watching for less than two hours, he found the available clues and notified Zhou Yanfei, and she came over. "Don't thank me, this is God to help you solve the case, you took the bonus and paid exactly five times the fine, and Daddy Thunder can make me delicious food again. ”

"That's what has to be done for you. Cheng Tingshen pinched the shoulder of the great hero Zhou Yanfei, and then gloated towards Tang Yunzhen. "You can't live by your own sin, thank you to the Tang team for your great contribution to our food improvement next month. ”

The other members of the first squad of the criminal investigation detachment, who could finally understand, also said to Tang Yunzhen. "Thank you, Team Tang!"

"Our guys eat, it's none of your business, what kind of fun! Do your own work!" Tang Yunzhen angrily drove away all the people watching the play next to him, and then pleaded with Zhou Yanfei while hammering his shoulder. "Honey, let's get a discount, you see that box of cigarettes, you know, I smoked one or two, isn't it because the case hasn't progressed I'm a little irritable, you can do it!

"Look at your performance. Zhou Yanfei snickered twice, then closed the information book and patted Tang Yunzhen's hand to signal him to stop. "I have to go to the scene in person, is there anyone here who wants to accompany the palace micro-service on the patrol?"

"I, I, I, I!" The others, who had not dispersed far just now, rushed to surround them again. "The goddess begs to be taken away!"

"Get out, are you all have nothing to do?" This time it was not only Tang Yunzhen, but even Cheng Tingshen came to drive people together, and he also risked the collapse of the cold personality, and complained very quickly. "Feifei, why did you take a month off, and when you came back, your painting style changed? Claiming to be the official, then do we call you Niangniang, or Lafayette? This afternoon, we also said that your trace inspection is Huaguo Mountain, shouldn't you be called king?"

"I've always been your eldest daughter here in Daddy Ting, and other people's words ......" Zhou Yanfei suddenly stood up and said in a playful manner. "Don't call me the king, call me the queen!"

"Speak, Your Majesty, we are all here to call. Tang Yunzhen cooperated with the act. "But I think in your eyes, I will definitely choose Yushu Linfeng......"

"You let me go!" Zhou Yanfei got up, raised his chin nobly and coldly, and raised his beautiful eyes, and at a glance he took a fancy to Cheng Fengqian, who couldn't squeeze in from outside the crowd, like a little sheep who had strayed into the wolves, and she urgently needed kindness to take him away. "Ah Feng, do you want to go to the scene with Sister Feifei to observe?"

"Think!" Cheng Fengqian looked flattered by the flop, and he couldn't see the envy, jealousy and hatred in the eyes of other colleagues. "The Queen, please take it!"

"Good boy! It's you!" Zhou Yanfei pulled Cheng Fengqian out while dialing the phone, and didn't forget to remind Tang Yunzhen and Cheng Tingshen before going out. "You go to the intelligence department to find Zhang Meina's medical records and medical treatment, whether it is a big hospital or a small clinic, and wait for me to come back for a meeting. ”

Cheng Tingshen looked at the backs of the two people leaving, and wanted to laugh a little, and helplessly touched Tang Yunzhen beside him with his elbow. "I want to ask Team Tang, is the leader of our team you or the Queen?"

"Look at her style, not only our criminal investigation detachment has three acres of land, but even our Xingang Police Station is the queen's decision!" Tang Yunzhen kicked away the other colleagues who were not selected by Zhou Yanfei, and also ran out. "Ah Ting remembered to look for medical records, and I also went to the scene. ”

"Oh, you guys...... Okay, okay, all gone!" Cheng Ting shrugged innocently, picked up the phone on the table and dialed the intelligence department.

Tang Yunzhen caught up with Zhou Yanfei and Cheng Fengqian in the parking lot, and she naturally took her as the driver.

Because it was the middle of the night, there was no one on the road at all, even if he drove Tang Yunzhen's dazzling sports car, it would no longer attract attention.

The three of them arrived at the street garden, and after identifying themselves, they smoothly entered the community and went directly to Zhang Meina's residence.

Because he had stayed at the scene for enough time before, Cheng Fengqian was much more familiar with the road than Zhou Yanfei, and he analyzed with her while leading the way in front of him with half a step. "It's always a homicide, and the possibility of robbery and murder is not ruled out, so in the past few days, there are no less than ten families in this building alone, Zhang Meina has also left one family on this floor, and two families have temporarily moved out, only Mr. and Mrs. Wang's family is still living, does Sister Feifei want to talk to them?"

"It's a big night, so I won't bother people. Zhou Yanfei shook her head and asked Cheng Fengqian to take her directly to Zhang Meina's household. "Studying the physical evidence at the scene is my home show, and if you police officers are more professional in cross-examining witnesses, I won't get an axe. ”

"Didn't Sister Feifei also stay in the police academy before?" Cheng Fengqian always thought that Zhou Yanfei left the police academy because he liked forensic science more than being a policeman, so he just asked casually at this time, and didn't notice the momentary pause in Zhou Yanfei's movements, who was holding gloves in the toolbox.

However, Tang Yunzhen's heart tightened, and he quickly diverted the topic. "Chartered wife, you said that there was a sudden murder in this kind of high-end community, is there anyone who wants to sell the house in a hurry? Will the price be much lower than the market? You are so familiar with the real estate agent, how much is the valuation here?"

"Why are you asking this, as long as you, the moonlight clan, still owe card debts, you can't afford to give you a 5% discount. Zhou Yanfei immediately ridiculed Tang Yunzhen, got up, and threw a pair of gloves to him. "Put it on and go to the bedroom!"