I am Detective Wu Nan

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DNA technology has been used in China for thirty years. As far as Wu Nan knows, China currently has nearly 600 DNA laboratories and thousands of DNA sequencing instruments. The total amount of data accumulated in the national public security DNA database has reached more than 40 million!

DNA data of about 3% of the population of China is stored in the public security DNA database, but there are almost no ordinary people among them. The targets of DNA data collection are all special existences, such as abducted children, criminals, and criminal suspects!

For example, some unsolved cases, although not finally solved, the public security organs have collected the DNA of criminal suspects in the process of investigating the cases. Then the DNA data of this criminal suspect will appear in the national public security DNA database!

If this suspect is arrested for other crimes many years later, and his DNA is collected by the public security organs. By comparing, it can be known that he is the murderer of a previous unsolved unsolved case!

Many unsolved cases are solved in this way!

There was no hope, but the murderer committed a crime again and was caught……

……

Thirteen years ago.

On September 20, 2004, in Taicang City, Suzhou, someone found a mutilated body of a girl in a wasteland near Jincang Lake. After investigation by the public security organs, it was found that the girl was named Bao Ting, only ten years old, a fourth-grade student at Taicang No. 2 Primary School. She disappeared after school on the afternoon of September 15, 2004.

The forensic doctor conducted a detailed autopsy on Bao Ting's body and confirmed that she died at around 11:00 am on September 18. She had been sexually assaulted before her death, with 29 injuries of varying sizes all over her body. Her left hand and left foot were missing, and a hard foreign object was violently stuffed into her mouth. The cause of death was suffocation due to breathing difficulties caused by bleeding in the mouth, damaged esophagus and respiratory tract…On

February 16, 2005, in Jinlang Town, Taicang, a sanitation worker found the naked body of a girl in a trash can while collecting garbage in the early morning. After investigation by the public security organs…The girl was named Li Yan, only six years old. She attended Jinlang Kindergarten before her death. She disappeared in front of her grandmother's house on February 13.

According to forensic identification, Li Yan died at around 5 a.m. on February 14. The cause of death was strangulation. She was sexually assaulted after death... On

June 9, 2005, near Xincang Village, Taicang City, two children who were catching frogs by the river on the weekend accidentally found a highly decomposed body of a girl in the river... After investigation, the girl was named Wang Jie, only 12 years old. She disappeared on the way home from school on May 11, 2005... On July 4, 2005

, an excavator accidentally dug up a woven bag containing the body of a girl while repairing underground cables on Dongting South Road, Taicang City.……

……

……

From September 2004 to April 2007, nine cases of missing and mutilated girls occurred in Taicang City, Jiangsu Province, China, and its surrounding villages and towns. The youngest victim was only 6 years old, and the oldest was only 12 years old. Six of them were raped and one was raped.

Although the cases were different, after cross-checking DNA and other clues, the Taicang City Police Department confirmed that the nine cases were committed by the same person, and then reported them to the Jiangsu Provincial Public Security Department, and then to the Ministry of Public Security. In early April 2007, the Taicang rape and mutilation of girls series of murder cases became a case supervised by the Ministry of Public Security.

On May 15, 2007, the Ministry of Public Security organized experts to consult on this series of cases, and merged nine cases of rape and mutilation of girls into one case, identifying it as the Taicang"5.15 Rape, Murder and Mutilation of Girls Case"!

The case was extremely serious. The murderer specifically targeted girls, was ruthless, and was extremely concealed, causing great social panic.

In order to solve the case, under the supervision of the Ministry of Public Security, the Jiangsu Provincial Police mobilized a large amount of manpower and material resources, carried out a large-scale investigation, arrested more than 80 suspects, and collected thousands of transcripts, but ultimately found nothing. In early

October 2007, the Jiangsu police announced the details of the case to the outside world and offered a reward of 300,000 yuan for clues.

The case has never been solved!

Ten years have passed!

It's still the same.

The Taicang 515 series of rape, murder and mutilation of girls cases has been hailed as one of the top ten unsolved cases in China's new century!

In Taicang, the impact of this case has continued to this day

*****

Guanjiang Garden, Unit 1, Room 601.

In the small bedroom, Wu Nan put down the cracked mobile phone, and then quickly opened the computer webpage and entered the search - Taicang case!

Just search these three words, and you can directly jump out the encyclopedia entry that Wu Nan needs.

It is the Taicang 515 series of rape, murder and mutilation of girls case, which can also be referred to as the Taicang series of rape and murder of girls case!

He just received a call from Zhao Chenglong. As soon as the DNA test results of the girl's body came out, Zhao Chenglong called Wu Nan. This was the result of Wu Nan's constant harassment in the past two days. He called every day to ask, in the morning and in the afternoon, and occasionally discussed the case with Zhao Chenglong on the phone!

Wu Nan didn't dare to harass his sister frequently, or he would be beaten, so he could only trouble Lao Zhao!

At present, Wu Nan already knew that the deceased was Luo Tiantian in the 630 missing case!

He also knew that after DNA analysis from semen stains, the murderer who raped, tortured and killed Luo Tiantian was the same person as the murderer of the 515 rape, murder and mutilation of a girl in Taicang ten years ago!

That's why Wu Nan wanted to search for the Taicang case!

The result really surprised him!

This case... is so big, so damn big!!

One of the ten unsolved cases in the new century, the murderer had committed serial crimes more than ten years ago, and disappeared after three years. For ten years, the murderer was no longer in Taicang, but in the Demon Sea. He committed crimes again, what is this? Is he coming back?

Wu Nan looked at the Baidu Encyclopedia of the Taicang case.

It was written in quite detail, all of which were the case details announced by the police at that time.

Wu Nan read it for a long time.

He couldn't stay calm!

After reading the encyclopedia carefully, he continued to search on the web, entered keywords, and searched for related news. He saw news reports from ten years ago and saw netizens analyzing the case on the forum...

The impact of this case is really huge!

However, after reading some of the analysis by netizens in the past, Wu Nan found that it was useless. On the contrary, it would affect his own thinking, because they had almost started to make up stories, and even made up the murderer's childhood experiences, saying that the murderer had experienced so much misery in the same year that he was so psychologically twisted and perverted!

You can't expect anything useful on the Internet, unless the murderer also pretends to be a netizen to participate in the discussion of the case, which may leave some clues.

You still have to look at the archives and files! Luo Tiantian's case must be investigated together with the Taicang 515 case! What

Wu Nan wants to see most now is the file of the 515 case in Taicang!

However, it is estimated that Mohai has just obtained the DNA comparison results and contacted Jiangsu, so the file will definitely not be seen for the time being!

But Wu Nan still couldn't control himself.

He glanced at the time on the computer. It was just a little after one in the afternoon.

Wu Nan got up and started to pack up.

Going to the police station!

_Feilu reminds you: Three things to do when reading-collection,