The more you can't get it, the more you want to get it. Qin Guiling sent him a text message, straight to the point, I like you, you can do it yourself.

A few days later, she received a text message from him: "But I don't like you." ”

Qin Guiling was about to burst into anger, and inquired in many ways, everyone said that Lai Lianji lived in his heart, and no one could replace him, but who was this mysterious girl who lived in the depths of Lai Lianji's heart? Is it real? Or maybe it's just an excuse he uses to reject others?

This is unknown. The reality that Qin Guiling saw was that he had been single for three years.

The official postgraduate entrance examination group of the University of Science and Technology is particularly active on Monday night, because Mr. Qin, who teaches high mathematics at the school, will post a math problem in the group for students to think, and then give the solution ideas and final answers.

It's Monday night again.

Teacher Qin's QQ is on.

Just after 19 o'clock in the evening, a math problem appeared on time in the QQ group.

"In the construction laboratory of a university, a boy from the civil engineering department fell to the ground, no longer breathing, and the cause of death was that the boy was stabbed in the back. Please use the Pythagorean theorem to calculate the time of death of the boy. ”

The students in the group were dumbfounded, what kind of math problem is this! Maybe it was because the graduate school entrance examination was approaching day by day, and Mr. Qin teased them, so no one took it to heart, and they all made their own exercise outlines.

Ten minutes later, Mr. Qin's QQ sent another message: "The answer is three o'clock in the afternoon, students, have you answered correctly?" ”

What a title?

On June 21, the Department of Civil Engineering began the final examination, and the first subject of drawing was examined.

The exam started at 3:30 p.m., but some students had already arrived at the exam room early.

As soon as the classroom was pushed, almost at the same time, a strong smell of blood rushed towards him......

The deceased Lin Fangjie, the deputy squad leader of the first class of civil engineering in 2012, according to the forensic examination, the time of death was 3 o'clock in the afternoon of the same day, and the cause of death was that he was stabbed in the back by someone, and died of excessive blood loss, and no traces of struggle were found at the scene.

"Gillian, it's hard enough for you to take on such a murder case just after graduating from the police academy." Senior Brother Qiu Yu patted me on the shoulder, "Come on." ”

I couldn't help but sigh and regret the loss of that young life that was still on campus.

It can be concluded that the examination room is the scene of the crime, but why did the murderer choose to kill people in the examination room? Today is the first day of the exam.

"Maybe the murderer did it on purpose and wanted more people to see it, or maybe the murderer wanted to attract more people's attention."

I turned to him, "But why did the murderer kill Lin Fangjie?" ”

He spoke quietly, thoughtfully.

"The minds of today's college students are really getting deeper and deeper."

At 4:25 p.m. on June 25, I was just about to drive to the technical department to collect my fingerprints at the scene when my mobile phone rang......

Something happened again......

The deceased, Cheng Xiaohan, a student of Class 2 of Electrical Engineering in 2012, died on the second floor of the school's special cafeteria, and a large amount of arsenic was found in the remaining dishes.

The two female classmates who witnessed the whole process of Cheng Xiaohan's death were crying and making notes.

"He seemed to be in pain, he kept clutching his chest, screaming miserably, someone called 120, and before the ambulance arrived, he collapsed......"

The time when Cheng Xiaohan fell down was exactly four o'clock in the afternoon.

There was a large amount of arsenic in the food in the canteen, which was okay, and the entire canteen was closed for a day, but after many tests, it was found that only Cheng Xiaohan's dishes were detected with a large amount of arsenic, and no one who was cooking that day had an accident.

In other words, the problem appeared in Cheng Xiaohan's dish.

The canteen aunt who cooked for Cheng Xiaohan recalled the scene when he was cooking.

"I have a little impression of him, a very serious boy, always come to lunch very late, should be going to graduate school, when he came to eat it was already half past three, the dishes were cold, and it was too early to eat dinner, he said that he was hungry when he read and read, so he wanted to come over and eat some, he ordered three dishes, one of which was fried eggplant was detected in a large amount of arsenic, but the strange thing is that according to the people who eat in the canteen, there are many people who order this fried eggplant, and the rest of the fried eggplant has not been detected with any toxic substances.

"This shows that arsenic is just in Cheng Xiaohan's dish."

In less than a week, two students were killed one after another, and the murderer was still at large, X Polytechnic University could not help but panic, and everyone on the road was full of sadness and weakness, and the pressure of the exam and the fear of death made many students have psychological problems.

In order to alleviate this oppressive atmosphere a little, the school decided to postpone the exams.

Will there be the next one? Who will be next?

In order to prevent any more classmates from having accidents, the bureau also attaches great importance to it, and Qiu Yu and I and several other senior brothers lived in Xiamen University of Technology to investigate, which was widely reported by the outside news media, causing quite a stir, and the bureau chased after it tightly and demanded that the case be solved as soon as possible.

"I really don't have a clue, how do I start?" I pulled a five-dollar bill out of my jacket pocket, stuffed it into a vending machine on the side, and ordered a bottle of Fanta.

Senior Brother Qiu Yu smiled: "It is indeed very strange that two students were killed inexplicably at the same time, it is very likely that this was done by the same person, so the question is, why did the murderer kill these two students?" What do these two students have in common? ”

"On this point, I have already checked, but there is something in common, they are all from the same high school, but it is not surprising that Xiamen University of Technology admits students in this city with reduced scores, and the proportion of students admitted in the city every year accounts for more than 50 percent, so it is not strange that the same high school is not surprising, and Lin Fangjie and Cheng Xiaohan are both preparing for the graduate school entrance examination this year, and they have added the QQ group for the graduate school entrance examination......"

Just then, my phone rang.

Hearing this, my brow furrowed.

"What's going on?"

"That QQ group for graduate school entrance examination ......"

"Hey, surnamed Lai, are you a man or not, if you are a man, you won't want to see me." Qin Guiling carried her skirt and followed his footsteps all the way, her face still flushed after being coated with BB cream.

Lai Lianji stopped, looked at her, and said in an indifferent tone: "Can you not follow me?" ”

After speaking, he turned his head and was about to leave, Qin Guiling still stepped up and followed closely, but he walked faster and faster until his figure was getting farther and farther away from her.

"Lai Lianji, I, I'm so afraid that something will happen to you!" She was almost crying and screaming with all her might.

It was dark, and the weather forecast on my phone said that there would be a typhoon in the next few days.

……

The person who reported the case was a girl in a grade 12 environmental engineering project, who looked nervous and her hands were shaking.

"I don't know if I should say it or not, or if it's just a coincidence, but it's too much of a coincidence." My voice was trembling, and I carefully comforted the little girl's emotions, telling her to try to calm down and tell her what had happened.

"Teacher Qin's math problem is problematic......"

The girl said word by word, her voice trembled and finally finished telling the truth of the matter, I asked the others to send her back first, and when the girl's figure gradually disappeared, Senior Brother Qiu Yu looked at me with a serious expression: "What do you think?" ”

"It's a bit ridiculous, but it's no coincidence, and it does provide a clue to our clueless investigation."

He boarded the QQ of a graduate student, opened the graduate school entrance examination group where Mr. Qin was, and paid attention to this person's speech record, among which there were two pieces of news that were really shocking.

One was posted on the evening of June 20, a non-feeling Pythagorean theorem topic: "In the construction laboratory of a certain university, a male student from the Department of Civil Engineering fell to the ground, no longer breathing, and the cause of death was that the male student was stabbed in the back." Please use the Pythagorean theorem to calculate the time of death of the boy. ”

The other was posted on June 24, the night before Cheng Xiaohan's death, and it had nothing to do with the Pythagorean theorem and asked to use the Pythagorean solution to the question: "In the cafeteria of a certain university, a boy who was preparing to take the graduate school entrance examination ordered fried eggplant, and as a result, a large amount of arsenic was put in the eggplant, and the boy was poisoned and convulsed to death, please use the Pythagorean theorem to calculate the time of the boy's death." ”

The two answers given by Mr. Qin were "three o'clock in the afternoon" and "four o'clock in the afternoon." ”

It was the time of death of Lin Fangjie and Cheng Xiaohan.

"It's not good, hurry up and arrest Mr. Qin, things can't happen to this point!"

The wall clock on the wall struck nineteen o'clock.

The graduate school entrance examination group rang again.

"Oops......"

"A boy fell from a school building and died on the spot, with his back down and head up, please use the Pythagorean theorem to calculate the time of the boy's death."

"Here we go again......"

This time, the time to give the answer was very fast, almost three minutes, and Senior Brother Qiu Yu and I and several other police officers were staring at the screen closely.

"Five o'clock in the afternoon."

We can't wait any longer, even if it's just a coincidence or a prank, no, it's impossible and not allowed to be a teacher.

We split up, someone called the bureau and mobilized a number of police officers to besiege all the school buildings, and got in touch with the principal, and the next day classes were suspended for one day, and all the school buildings were sealed. At the same time, Senior Brother Qiu Yu also "invited" the legendary Teacher Qin over, and as the number one suspect, he temporarily lost his personal freedom.

"I explained to you that my QQ was stolen, and I also had alibi evidence at the time of the crime, and I slept in my room when I sent the QQ message."

Senior Brother Qiu Yu sneered: "But our technicians have checked the IP address of the Internet and confirmed that it is undoubtedly your home." ”

"Coincidence, this must be a coincidence!"

"Is there such a coincidence?"

Time passed little by little, and Mr. Qin did not back down at all, insisting that the whole thing had nothing to do with him, and it was almost 17 o'clock in the afternoon.

The suspect has been controlled, and all the school buildings have been cordoned off, but why, my heart is still extremely uneasy, as if there is something wrong, this bad premonition is spreading step by step, although there is no scientific basis for the sensitivity of this profession, but it has always been accurate.

There are still ten minutes to go......

"Gillian, why are you going?"

"I'm not worried, I'll check again to see if all the school buildings have been locked down."

The school has a total of seven teaching buildings, Building 1 and Building 2...... Building 6, Building 8.

It dawned on me: "Why is there no Building Seven?" ”

The principal on the side explained: "Building 7 is being rebuilt, but there are usually no students going there on weekdays, and it is far away from the dormitory, and it is also ......desolate."