The subsequent investigation brought unprecedented difficulties to the police. First of all, the surveillance cameras are so far away that the faces of the victim and the attacker cannot be seen clearly, and the surveillance cameras on other sections of the road did not capture the two people. What is even more troublesome for the police is that they did not find any identity-related documents on the victim, not even a cell phone. Unable to delineate the identity of the murderer and the victim, coupled with the relatively remote scene of the incident, the criminal police visited and investigated hundreds of people in three months, but there was no result. This case has become a cold case.

Later, the case was dug up by the well-informed Pingjiang Evening News reporter, wrote an article published, but also came up with an eye-catching name-zombie night attack woman. For the first time, the article named the killer with "Zombie", a popular element in European and American horror blockbusters. It also focused on the strange walking posture of the attackers and the strange injuries suffered by the victims, and wrote a crime news like a horror novel. To make the citizens suspicious. The police did not clarify the matter. But no one expected that this horrible scene would happen again three months later.

Three months later...

Ding Qian walked into the classroom of the School of Psychology of Donghua University with books in his arms. He teaches psychiatry in clinical medicine. It is not a hot subject, but there are many students who take his courses, because Ding Qian's lessons are better, and his lectures are not rigid in textbooks, just like a storyteller. However, Ding Qian met a girl who gave him a headache today.

She asked Ding Qian, "teacher, do you believe there are zombies in this world?"

"Zombies?"

"those monsters in horror movies that walk around and scratch and bite when they see people."

“first of all, I have to tell you what a zombie is," Ding Qian said with a smile. "zombies are living people whose brain nerves are killed by a virus or radiation, leaving only a dead body with primitive behavioral abilities, commonly known as the living dead. In other words, they are moving dead people who eventually perish as the body gradually decays. if you ask me if there is such a thing as zombies. I'm sorry, I'm a psychology major, so you should ask the biology teacher. "

All the other students laughed at this.The girl still persevered, "there has just been a zombie attack in the United States, a naked zombie grabbed a homeless man and bit him covered in blood." This girl is pure and lovely, with short hair, a small V-face and big eyes that rotate flexibly like black grapes. She is a standard beauty. It's just that the hobby is a little scary, which scares the girl sitting next to her to the side.

"I heard about that case. Although the killer is called a 'zombie' in the media, strictly speaking, he is not the kind of zombie we think he is. But a drug addict who was deranged by taking a large amount of hallucinogens before the crime. " Ding Qian said: "A kind of narcotic drug has a very strong psychedelic effect." Taking this drug can lead to a rise in body temperature, loss of mind, and become very aggressive. To outsiders, irrational drug users do behave like zombies in movies. But in itself, he is still human. "

"apart from taking drugs, is there no other way to turn into a zombie?" The little girl is not satisfied, continue to ask questions.

"this. I suggest you watch those horror movies and you'll get the answer. "

"teacher, I'm serious."

"I'm serious, too." No matter how good Ding Qian's temper is, he is a little angry. This girl is obviously here to make trouble. Such strange students are still rare. After class, he left the classroom with his books and heard someone calling him behind him. Ding Qian turned around and saw the girl who made trouble in class coming up.

"do you have any more questions?" Ding Qian asked.

"Mr. Ding didn't answer my question just now. I just want to know if there is any other way to turn a person into a zombie besides taking drugs or drugs. Or to put it simply, are zombies a physical change or a psychological change? "

Looking at the girl's serious appearance, Ding Qian did not know whether he should get angry, thought about it and asked, "do you still have a boyfriend?"

The girl was stunned for a moment. "No."

"I suggest you find a boyfriend as soon as possible, so you don't have to think about these boring questions." Just as Ding Qian was about to leave, the girl sank her face, took out her certificate from her pocket and said, "first introduce myself. My name is Guo Rongrong. I am a policeman of the special case investigation team."

“Special case investigation team?!”Ding Qian has never heard of this department. Guo Rongrong doesn't seem to be a liar.

Seeing Ding Qian in a daze, Guo Rongrong smiled, "I heard that Mr. Ding is also a famous psychiatrist. I thought you could see my identity."

"I'm a psychiatrist, not a fortune teller."

"......"

"I don't know you. Why did you find me?" Ding Qian asked.

"it was Officer Song Yulin Song who introduced me. You should know him."