When checking out, Ding Xiaoqian's eyes fell on a middle-aged and slightly fat man near the corner.

"What's wrong?" Xu Ziqian looked at Ding Xiaoqian's eyes.

Ding Xiaoqian withdrew his gaze: "It seems that he has seen that person somewhere, and he looks very familiar."

The middle-aged and slightly fat man was eating alone and a photo album was strangely placed on the table. At first glance, it looked like a standing menu, but the menu in this store was pressed on the glass floor and was not standing.

"Do you know that person?" the cashier said curiously, as if he was a person who could talk about it.

"Have he often come after meeting him?" Xu Ziqian actually had no impression of that man. The middle-aged man looked kind and ordinary, and he could not find him if he threw him into the crowd. His temperament looked very introverted, as if he kept his head down, afraid of being in the sight of others.

The cashier showed a regretful expression: "This man's mother died of an accident two months ago. Before that, he would come here to have dinner with his mother almost every month. This time he came with his mother's photo." The cashier said in a low voice.

Xu Ziqian and Ding Xiaoqian looked at each other.

After paying the bill, the two left the restaurant. There will always be people who do something futile because of something, but it is difficult to empathize with it if it doesn't happen to them, and it will be impossible to evaluate whether it is really futile.

The next day, Xu Ziqian and Ding Xiaoqian went straight to Jiangbei University of Technology without the police station in the morning. They also hoped to find the president of the university for the case and asked him to cooperate more.

Unexpectedly, as soon as I arrived at the principal's office, I saw a bunch of people surrounding the door, chattering and talking. The narrow corridor echoed with all kinds of noisy sounds, which made people feel a little troubled.

Standing there and listening for a while, Ding Xiaoqian finally understood.

It turned out that this group of people came to ask the principal for money. When they heard that the person was gone, they thought about asking for some pensions, but they were not satisfied with the amount given by the principal, so they got stuck here and made trouble.

As he spoke, the middle-aged woman in a sweatshirt lamented: "I have long said that Si Niu's life is not good, she is a pure Yin life, so she shouldn't have run around. This is not good, she was killed suddenly. To be honest, I'm not surprised at all. This is destined, but Si Niu, why did you die so miserably?"

"What does pure yin mean?" Ding Xiaoqian said in confusion.

"The birth date and eight characters are composed of four heavenly stems and four earthly branches. If these eight characters are all negative, it is called pure yin. Such people are very rare. In the Book of Changes, people with full yin life are not good. They are prone to short life and defeat their parents." Xu Ziqian explained roughly.

Ding Xiaoqian helped her glasses: "How do you judge that all birth dates and horoscopes belong to Yin?"

"The heavenly stems are Jia, Yi, Bing, Ding, Wu, Ji, Geng, Xin, Ren, Gui, Zi, Chou, Yin, Mao, Chen, Si, Wu, Wei, Shen, You, Xu, and Hai are called the twelve earthly branches. Among the ten heavenly stems, Jia, Bing, Wu, Geng, Ren is Yang, Yi, Ding, Ji, Xin, Gui is Yin. Among the twelve earthly branches, Zi, Yin, Chen, Wu, Shen, Xu is Yang, Chou, Mao, Si, Wei, You, and Hai are Yin."

Ding Xiaoqian nodded knowingly and frowned slightly.

After waiting for a long time, the principal handled the murder of the cleaner. Xu Ziqian and Ding Xiaoqian then walked into the principal's office.

The principal was helplessly wiping his sweat. It was beyond his expectations that such a thing happened, but the cleaner had been working here for more than two years and had signed a contract. Even if he was unwilling to do so, he had to pay the money.

"Hello, we are policemen..." Ding Xiaoqian said this, and the principal interrupted him in a constant manner.

"You are here just right, hurry up and solve the case. What's wrong? I don't know what happened, so a cleaner and a student died and sent the cleaner's family away. I'm afraid the student's family will come soon." The principal was impatient and asked for money when he came over without asking.

"We are here this time to ask the principal, you will cooperate with our work. After preliminary investigation, we found that the murderer is likely to be hiding in the campus where the murderer is not found as soon as possible, the number of the victims may increase." Ding Xiaoqian raised his voice and tried his best to make his voice appear mature and firm.

"Hey, find it quickly. When is this the end? Who is such a cruel man? As the school, we will definitely cooperate with the police station's actions. As long as you can solve the case as soon as possible, I will be grateful." The principal kept wiping his sweat. He had lost his temper by this matter these days, and just thought that this matter would be over as soon as possible, which was better than anything else.

"Then I'll just say that the two victims are from Jiangbei University, which means that the murderer is also likely to be in this university. He is familiar with the identity of the victim and the schedule of the victim, so he can commit crimes without anyone noticing it. This is one of them."

Xu Ziqian glanced at the principal. The principal's originally impatient heart calmed down instantly. For some reason, the principal felt that the young man in front of him had a strong aura. Even though he had seen so many markets, he couldn't help but feel a little fluctuating in his heart at this time.

This young man is really extraordinary, and the principal made a judgment in his heart.

"The second is that the victim's death is a dangerous element. This element seems to be available in Jiangbei University in the mainland. Relevant news has been published in newspapers for two years. If I remember correctly, it should be Professor Tian, ​​right?"

The principal nodded: "Yes, you're right. There is indeed a professor of chemistry named Tian in our school. At that time, he got 35 grams of rare and dangerous element drops. I didn't expect that the power of that chemical element is so amazing. Wait a minute... Do you think it was made by Professor Tian?"

"Impossible, absolutely impossible. The 35 grams of rare dangerous element is placed in the safe in the school's basement, and it will never be used by anyone. Moreover, Professor Tian is not that small. People across the country know that he holds that dangerous element. How could he use that dangerous element to kill people? Isn't this equivalent to telling people across the country that he is the murderer? What's more, Professor Tian has retired long ago, and it is Teacher Wang who manages chemical agents now." Before Xu Ziqian could speak, the principal refuted himself.

"You are right. Of course, it's impossible to be Professor Tian, ​​but we want to confirm whether the chemical element is still installed in the safe in the basement."

"No problem, our school's teachers are very reliable. Whether it is Professor Tian or Teacher Wang, they have never done anything inappropriate. Especially Teacher Wang, although he is young, he is honest and gentle, and has never had too many items in the basement in the past two years." The principal talked happily while walking.

"I'll take you to find Teacher Wang."

"How many chemistry teachers are there at Jiangbei University of Technology?" Xu Ziqian asked.

"There are three chemistry teachers working on this campus, and the one who stayed here for the longest time was Mr. Wang, so the safe in the basement was handed over to him to guard."

Three. Xu Ziqian and Ding Xiaoqian exchanged glances with each other. Even though they didn't say anything, they could understand what the other person was thinking.

In other words, there are three suspects.

Only these three people understand how to use the dangerous element. Then among these three chemistry teachers, one of them has a certain chance of being the murderer who killed two people one after another.

After going down two floors, the principal came to a closed door and reached out and knocked twice: "Xiao Wang, are you here at Xiao Wang? There is something to do when you open the door."

Then the principal explained: "Although today is Saturday and he usually won't be there, two months ago, he often stayed in the office, sometimes he didn't even go home, just slept in the office every day, ate in the cafeteria during the day, or went to teach classes."

A light flashed in Ding Xiaoqian's eyes in his lenses. He noticed the words the principal said for more than two months, a middle-aged and slightly fat man appeared in front of him. Could it be the man he met that day?

With a creak, the door opened from the inside. A slightly fat man poked his head out and saw so many people standing outside, he shrank back a little.

"Principal, is there anything wrong?"

"This is Teacher Wang from our school. In this campus, he is the chemistry teacher who has been staying at school for the longest time and has the longest qualification. He looks quite young, and seems to be in his thirties. In fact, this little Wang is already in his early forties." The principal introduced with a smile.

Noting that Xiao Wang was still expressionless, the principal greeted: "Don't be stunned, let the two policemen come in and sit down, and you can take people to the basement of the school later."

"Okay." Although Xiao Wang was reluctant, he still opened his body. No matter what, this is an office, office place, not a private place.

"Then I've lost my companionship when I visited slowly." The principal's phone rang at the right time, so he followed the phone and retreated from the office door.

After entering Xiao Wang's office, Ding Xiaoqian was stunned. The walls of Xiao Wang's office were almost full of portraits of an old woman. There were sketches, oil paintings, colors, and photos, artistic photos, all kinds of crowded in every corner of the room.

Xiao Wang obviously didn't want to be seen. The moment he turned around, he immediately hurriedly put away the hanging portraits and photos. After packing up, he looked at Xu Ziqian and Ding Xiaoqian with a slightly swelling face.

"Where do you want to visit? Are the elements in the basement right? Come with me." Xiao Wang said quickly, and his voice felt a little nervous, probably because the secret of the room suddenly leaked in front of others.

Ding Xiaoqian nodded and said, "Yes, I want to see if that dangerous element is missing."

Xiao Wang's eyelids jumped unconsciously. He quickly lowered his head, lowered his eyes, and reached out to grab the key disk: "Yes, just come with me."

Following Xiao Wang on the road, although Xiao Wang looked a little fat, he walked very fast, and Ding Xiaoqian also accelerated his pace to keep up.

"Teacher Wang, do you know what the dangerous element is for?" Ding Xiaoqian asked suddenly.
Chapter completed!