The second floor also has three bedrooms and a living room. Except for the study room in the north, the rest of the place is in a mess.

Tan Yi went straight into the study room.

Zheng Jiasheng followed him in. "I don't understand what you are looking for?"

Tan Yi said, "Any suspicious items."

Zheng Jiasheng said, "My wife is Wan Donglai's biological daughter. Why should we kill them?"

Tan Yi picked up a piece of manuscript paper from the table. On it was a huge word "忍". "Your father-in-law and mother-in-law are dead, but you don't care about your wife and two nephews. Don't you think it's abnormal?"

"Heh~" Zheng Jiasheng sneered, "What's wrong with this? They look down on me, and I look down on them too. What does it have to do with me whether they live or die? I think I have done my best by pouring so many basins of water to put out the fire."

As he said this, he turned his head and glanced outside the door, "The ice is not formed in a day. You say I am cold, but I think the Wan family is even colder."

He was not only talking about the Wan Donglai family, but also about Wan Chunlan.

As the saying goes, it is difficult for an honest official to settle family affairs. It is certain that the two families have conflicts, but whether they will kill people depends on the evidence.

Tan Yi ignored Zheng Jiasheng, sat down on the chair behind the desk, and opened several drawers one by one.

The drawers were filled with various instruction manuals, papers, pens, medicines, calculators, photos and other miscellaneous items.

There are quite a few books on the bookshelf. The bottom layer is extracurricular tutoring books such as mathematics and Chinese. The other layers are all novels - romance, martial arts, mystery, history, about one or two hundred books, of which mystery novels account for one third.

Zheng Jiasheng said sarcastically: "Why, is it illegal to read novels?"

Tan Yi took out a mystery novel called "Psychological Black Hole".

He has read this book. There are a total of 20 cases in it, one of which is about fire.

This novel describes in detail the whole process of the murderer setting the fire, as well as the psychological analysis of the arsonist.

The story is thrilling, and the criminal method is highly feasible.

But the whole book was very clean, without any marks, folds or outlines. He didn't even know whether Zheng Jiasheng had read it.

He asked Zheng Jiasheng: "Who has read this book?"

Zheng Jiasheng said: "My bookshelf, of course I have read it. Both children are studying and they are doing well. How can they have time to read these idle books?"

Tan Yi put the book in the evidence bag: "Is your daughter at home?"

Zheng Jiasheng said: "She just got home from evening self-study."

Tan Yi frowned, "Does she have a bad relationship with her grandma and grandma?"

Zheng Jiasheng said angrily: "You policemen have such dirty hearts. Didn't you see that my daughter's eyes are swollen from crying?"

Tan Yi said: "I'm sorry to make you feel unhappy, but we don't want this to happen. Although there are more good people in this world, bad people can also be bad in many different ways. If a policeman doesn't think of several possibilities, he won't be able to solve the case."

Zheng Jiasheng did not comment and snorted coldly.

Tan Yi said, "So, you still have to answer my questions carefully. May I ask, what time did your daughter finish school? Where was she when the fire broke out? Why hasn't your son shown up yet?"

Zheng Jiasheng said, "My daughter was still in school at the time, and my son lived in the school dormitory in his third year of high school and didn't come back at night."

Tan Yi said, "When did your daughter come back?"

Zheng Jiasheng said irritably, "Of course it was after the fire, my wife took her and my two nephews back together."

The little girl didn't have time to commit the crime.

...

Tan Yi searched the study and even the trash can, but didn't find any clues.

After coming down from the building and reaching the door, Wan Chunlan wiped her eyes with a towel and said "Puh" to Tan Yi, "You are the beast who killed your father and mother."

A police officer scolded, "I warn you, 'Article 42, Paragraph 2 of the Law on Punishment for Public Security Administration: Anyone who openly insults others or fabricates facts to slander others shall be detained for not more than 5 days or fined not more than 500 yuan.'"

Wan Chunlan was furious and glared at him and shouted, "What! The police can openly insult people, search and interrogate, and bully honest people!"

Another police officer said, "Our search is based on the law. If you are dissatisfied, you can go to the higher authorities to complain."

"Fuck." Wan Chunlan cursed, "You took my parents away, and there's no one to take care of my two children. How can I have the time to complain? Get out, all of you!"

Tan Yi looked back at Zheng Jiasheng standing on the stairs. The latter had a sneer on his lips, as if to say, look, there are no good people in the Wan family. After

leaving the Zheng family, there were still more than 20 ordinary people standing outside to watch the excitement. Several burly men were recounting everything they saw and heard in a rough voice.

They may have sympathy and compassion for the deceased, but it was covered by gossip and the desire to perform, which made people feel disgusted.

Tan Yi walked towards the cheap restaurant, and just as he reached the door, Wang Zheng and Ren Yaguang came out from inside.

Wang Zheng said, "Captain Tan, the Chang family didn't find anything unusual, but the Chang family said that the Wan family ordered dinner from her family, including hot and sour potato shreds, fish-flavored pork shreds, and a dish of clam stewed with tofu."

Tan Yi remembered what Xie Qing said, "Brother Wang, arrange for a few people to go to a few hospitals and nearby clinics to ask the two families if they have ever been prescribed tranquilizers."

Wang Zheng immediately gave the order.

"Uncle police." The two children got out of the car, "Have you found the murderer?"

Tan Yi shook his head with a heavy heart, "Uncle will take you home and talk about the specific situation of your family."

The older boy said, "Okay, I'll take you back."

...

Xie Qing opened the chest, abdomen and neck of the victim Xue Baoyi.

The respiratory tract and lungs were damaged, with smoke and carbon dust deposited on the mucosal surface, mixed with mucus to form black linear sputum, and diphtheria-like pseudomembranes formed in the larynx, epiglottis, trachea and other parts... The above changes are heat-affected respiratory syndrome.

This shows that the victim was still able to survive when the store caught fire.

Xie Qing carefully studied the lungs, heart, digestive tract, etc., and obtained conclusive evidence of burns before death.

The stomach contents are the key to the case.

The deceased's stomach is still full, and only a small part of the contents have moved to the duodenum, indicating that the deceased died shortly after his last meal.

Xie Qing screened the stomach contents and found no diazepam residues, so the possibility of collective suicide among the family of four was almost eliminated.

She took samples of gastric juice and blood.

Cao Haisheng put down the camera, "You and forensic doctors An and Ding complete the next work, I will take the samples back to the technical room first."

Xie Qing said, "Okay, Master, be careful on the road."

Cao Haisheng took off his white coat and left in a hurry.

Xie Qing quickly sutured the body.

Forensic doctor An sighed, "Your master has found a good apprentice for himself."

Forensic doctor Ding nodded, "I will be satisfied if the apprentices I take in the future can be half as good as Xie."

Xie Qing smiled awkwardly. She is a jerk pretending to be young. She is guilty!

...

When the four bodies were put into the freezer, Xie Qing received a call from Cao Haisheng - in two samples, concentrations of drugs were found that were enough to cause the victims to fall asleep. Xie

Qing told the two forensic doctors.

Forensic Doctor An said: "Xie, you guessed it right at the first try, amazing!"

Xie Qing spread his hands, "It was mainly inspired by the case of the machinery factory."

Forensic Doctor Ding smiled: "This explanation is reasonable, after all, the string in my mind is still there."

The three returned to the autopsy room, cleaned the autopsy table, changed into their own clothes, and left the funeral home together.

...

Tan Yi and Wang Zheng were still in the victim's home at this time.

The four victims were from the north. Five years ago, they came to Wan Chunlan and bought a three-bedroom, one-living room house and this store in Haiqing Community.

Wan Donglai and his wife lived in the store, while Wan Chunshu and his wife and their two children lived upstairs, and they got along well with each other.

The Wan family had always been engaged in small trade and was well-off. Because the winter was too cold, they had always wanted to move out of the north.

Anhai has four distinct seasons, not as cold as the north, and Wan Chunlan's business was also good, so the family came to Anhai.

When they decided to move, Wan Chunlan made a lot of efforts in choosing the house and store, decorating the house, and enrolling the two nephews in school.

Therefore, in the following days, she often regarded herself as a hero and took the goods from Wanjia Supermarket at will.

Since then, there have been small frictions between the two families.

Everyone could tolerate it at first, but it became unbearable after a while, especially Xue Baoyi, who hated her sister-in-law.

Cooking was too tiring, and Zheng Jiasheng didn't care about anything except the purchase of goods. Wan Chunlan could handle it at first, but after having her uterus removed two years ago, her health was not as good as before, and she was not as attentive to the business as before, and the income was getting less and less. When you are

poor, you have to think about change. Wan Chunlan thought of forming a partnership with her mother's family. She thought she was a hero of the Wan family, and she was right when she said it, but she didn't expect to be opposed by most of the Wan family - only Wan Donglai felt that people should not be without conscience. His daughter had made contributions, but her health was not good, and the Wan family had the ability, so they should help her.

But Wan Donglai was afraid, and even if he thought so and said so, he still couldn't persuade his wife and children.

This caused the two families to completely tear each other apart, and within a week, the Wan family suffered a devastating disaster.

The older boy Wan Huining was a good student in class. After calming down, he carefully sorted out the conflicts between his family and Wan Chunlan's family to Tan Yi.

Tan Yi believed that Wan Chunlan had a violent personality and was indeed a suspect, but it was too arbitrary to infer that she killed the four members of the Wan family without finding any conclusive evidence.

He said to Wan Huining, "The dead cannot be resurrected, you have to be stronger. Before the suspect is caught, your aunt's family cannot be trusted, but you should not show it, just know it in your heart, understand?"

Wan Huining wiped his tears, "I understand, but police uncle, I'm scared."

Tan Yi thought for a moment, "Uncle will give you a room in the hotel, you can take your brother to stay for a few days, how about it?" Wan Huining nodded

quickly, "Thank you, police uncle."

Wang Zheng reminded in a low voice, "Captain Tan, this kind of expense can't be reported to the bureau."

Tan Yi said, "It doesn't matter, I'll pay for it myself."

Wang Zheng looked at him with admiration. He always thought that Tan Yi was a difficult person to make friends with, and would never be as approachable as Huang Zhenyi, but he didn't expect him to be so considerate at the critical moment.

There is a three-star hotel not far from Haiqing Community, and Tan Yi sent the two children there.

After settling in and returning to the police car, the police officers Wang Zheng sent to various hospitals to investigate received a response.

There were a total of two people in the Wan, Zheng, and Chang families who had been prescribed tranquilizer pills - one was Wan Donglai (one of the deceased, Wan Chunlan's father), and the other was Chang Yaru of the affordable small restaurant (the proprietress who had quarreled with the Wan family and Wan Chunlan).

So, did Wan Donglai commit suicide because he was dissatisfied with his wife and children?

Or was Chang Yaru a mentally ill person who put drugs in the dishes ordered by the Wan family because of trivial matters?