Changzhou is a densely populated, very mobile city, but also a very fast pace of life in the city, in this steel city, facing the pressure of work, life, family, everyone always has something to do, can not finish the business, in addition to physical fatigue, there is also a huge mental pressure, behind the bright light, dark seeds quietly breed.

As the sun sets, the playground is quiet, and a little boy walks thoughtfully under the basketball hoop with his hands in his pockets.

"Smack!"

A man in a trench coat stood next to him and lit a cigarette, his well-defined face with piercing eyes.

The man in the trench coat took a deep puff of his cigarette, and the exhaled smoke was blown to the little boy's side by the wind, and the little boy frowned slightly, and fanned with his palm.

"Excuse me!" The man in the trench coat noticed him and walked over, "Little friend, why haven't you come home yet?" ”

"I was waiting for my dad to pick me up, and he told me not to go home alone for the next two days." The little boy childishly replied that he should be a junior high school student.

"I see!"

"Uncle, are you a policeman?"

"yes!"

"So have you ever solved a particularly powerful case, such as a murder in a closed room?"

The little boy's question amused the man in the trench coat, and he replied seriously: "That's just a beak in literary and artistic works, almost no one will try it in reality, the biggest effect of secret room murder is to make outsiders mistakenly think that the deceased is a suicide, but the police have scientific and rigorous standards for the judgment of suicide and homicide, and falsifying the scene will not only fail to deceive the police, but will also leave more clues and flaws!" So you see, this is simply a negative return for the murderer! ”

"I look at Conan, all the secret room killings are fake, so is there a real secret room killing in the world?"

"As long as he kills it, there can be no real secret room!"

"But I know a way to make a real chamber!" The little boy said with his head held high and a conceited expression.

"yes, let's hear about it!" The man in the trench coat showed an interested expression.

A man came from the direction of the school gate and shouted "Yangyang", and the little boy stuck out his tongue and said, "Uncle policeman, my father is here to pick me up, and when you catch the murderer, I will tell you the answer!" ”

"Okay, I'm looking forward to it!" Song Feipeng smiled, "Your name is ......"

"Wang Haiyang, my dream is to be a policeman!" The little boy saluted obediently and ran away laughing.

Seinfeld waved at him, and when the boy and his father disappeared, he retracted his thoughts, smoked a cigarette and continued to think about the case.

A female teacher was killed in the staff break room three days ago.

The deceased's name is Liu Jia, a long-haired girl who likes to wear plain dresses, 25 years old this year, just started working, her father Liu Siyi is the school's director of teaching, and her uncle is a leader of the Education Bureau, this relationship makes Liu Jia seem a little special among the many teachers in the school.

When they came to claim the body, Liu Jia's parents cried so much that they almost fainted, they said that Liu Jia is usually well-behaved and sensible, she has longed to be a people's teacher since she was a child, and she was excellent in character and learning when she studied in a normal college, and was later admitted to Yuxiu Middle School with excellent results.

However, the results of the scout's investigation are very different from the statements of the deceased's family, Liu Jia does not seem to be a qualified people's teacher, and the students in her class report that she is usually moody, treats students differently, and often insults students with poor grades with ugly words, and if there are students in the class who violate discipline or do not listen to discipline, she will let her boyfriend, who is a physical education teacher, take away the students who violate discipline and give them corporal punishment in disguise.

A teacher also revealed that Liu Jia wore a short skirt to work in the summer, and the school explicitly forbade girls to wear such skirts.

The teacher said, "Liu Jia's skirt is so short, so short that you can faintly see the curve of the buttocks, you know?" ”

This incident was summarized as Liu Jia's uncle was the leader of the Education Bureau, and he did his own thing in school.

If these evaluations are somewhat subjective, then there is one thing that happened to Liu Jia, and it is really difficult to get rid of her responsibility.

In a fit of rage, she locked a boy with poor grades in the office to do an exercise, but she and her boyfriend left first.

At about nine o'clock in the evening, the boy wanted to go home so much that he planned to escape through the window, but he accidentally hung up his trouser legs and fell headfirst to the ground, resulting in a fracture of the cervical vertebrae, and he was lying down until the next morning, and he was found dying.

Liu Jia's biggest punishment for this incident was that the boy's parents slapped her when they came to the door, and then the school came forward to solve it, compensated 100,000 yuan for medical expenses, and suspended Liu Jia.

But she only stayed at home for a year and then came back to work, and the students had graduated, but the teachers still remembered it, and they knew that Liu Jia had someone behind them.

"Problematic female teacher!"

This is Seinfeld's evaluation of the deceased, after smoking two cigarettes in a row, he was too addicted, and he walked to the teaching building.

Several officers of the technical squadron were using metal detectors to look for possible murder weapons in the flower beds, and preliminary autopsy determined that the deceased was hit in the back of the head with a blunt object, resulting in intracranial hemorrhage and died, and there were also multiple hammer wounds on the body, judging from the shape of the wounds, it should be a round-headed hammer.

Judging from Seinfeld's investigation experience, the murderer chose a murder weapon that maximizes efficiency, the lethality of a blunt weapon is very powerful, it can kill with one hit, and it will not bleed too much, and the hammer hits the back of the head, which will instantly make the deceased unable to resist.

It is also a very brutal method, either with a deep hatred, or if the murderer has at least one or more murder experience.

He came upstairs, returned to the scene of the crime, the door was open, pushed the door in, and a person lay on the ground, as if looking for something.

Song Feipeng recognized that it was Xiao Wang, and coughed in the past, Wang Bing hurriedly got up, panicked for a moment, his head hit the desk, he covered his head and stood up and said, "Ah, captain, you haven't left yet?" ”

"What are you looking for? Are there any major discoveries? Seinfeld asked gently.

"It's nothing, it's just that I stumbled upon something under the table and was going to take some samples."

"yes, I'll see."

The two lay down, Seinfeld was on the outside of the desk, and Wang Bing was on the inside of the desk.

The gap between the bottom of the desk and the ground was so narrow that you had to put your head almost on the ground to see clearly, Wang Bing held up his phone, kept the lighting mode, shook it inside, and then turned it off, and Song Feipeng saw a small cluster of green glowing light......