After Chen Guan and Du Hui led the team to Linguan, they first contacted Huo Shen, an old acquaintance and deputy director in charge of criminal investigation of the Linguan Public Security Bureau, and asked Huo Shen to lead him to meet the director and political commissar of the Linguan Public Security Bureau.

The "10?20" series of robbery, rape and murder cases itself includes the Linguan "10?17" Hulugou Village bloody case, and the Linguan police's eagerness to solve the case is the same as that of the Mingshui police, nothing to say, full cooperation!

Chen Guan: The first thing they looked for was naturally Cheng Xiaojun's concubine "Spicy", nicknamed "Little Lintong".

Linguan County is not big, and women like "Spicy" who have no serious profession and live by being someone else's concubine are all in the brains of the police, easy to find!

During this period of time, the police conducted a large-scale investigation, and Cheng Xiaojun had nowhere to go, so he didn't dare to show his head, so he hid in the house of "Lazi", and was arrested by Chen Guan and them.

It took a lot of effort to arrest Chen Liang, nicknamed "Awl", and this guy pulled a gang by himself to do evil in the Linguan mining area. After the "10?20" series of robbery, rape and murder cases, the cunning Chen Liang smelled the smell of danger, and led his gang from the Linguan mining area to the Sangyuan mining area, disguised as a migrant worker, and worked in the migrant labor team, in an attempt to get by. It's a pity that Chen Guan and they tracked them down, and they vowed not to give up until they reached their goal, and Chen Liang and his gang hid deeply, after all, they made a name for themselves in the Linguan mining area, and there were many people who had seen them, and there were traces to follow, and it took a week to arrest Chen Liang's gang in a mine cave in the Zaoyuan mining area.

Chen Liang, Cheng Xiaojun and Li Bao, who was imprisoned in the ancient capital prison, respectively confessed to following the little man Xiaoqiang to commit the crime.

According to the confession of the three people, from 1994 to the spring of 1995, they followed Xiaoqiang to commit 19 crimes in Tonghua Town, Linguan Mining Area, and Zaoyuan Mining Area. However, after the spring of 1995, they all lost contact with Xiaoqiang. As for Xiaoqiang's real name and home address, the three of them, like Tenghui, don't know Lu Dao, they only know that Lu Dao Xiaoqiang may be from Zhouzhi near Xijing, Qin Province.

From the confessions of Bi Xicheng, who is nicknamed Tenghui, Chen Liang, who is nicknamed "Awl", Cheng Xiaojun, and Li Bao, who is nicknamed "Xiao Lintong", it can be determined that "Xiaoqiang" is the main culprit of the "10?20" series of robbery, rape and murder cases!

The most important thing is that these four murderers confirmed that Xiaoqiang is 1.58 meters tall, about 30 years old, and has served as a soldier in Yunnan!

Although the "10?20" series of robbery, rape and murder cases have not been solved so far, and even the real name and home address of the little gangster nicknamed "Xiaoqiang" are unknown, but the criminal police know that Chen Guan's "10?20" series of robbery, rape and murder cases are correct, and the results have been achieved, and the three murderers Bi Xicheng, Chen Liang, and Cheng Xiaojun have been arrested, Li Bao has been retried, and a series of backlog cases have been cracked, and the main culprit "Xiaoqiang" is about to surface!

Li Bao was imprisoned in the ancient capital prison, and it was Lin Fei who interrogated him, and Chen Guan never saw him. Chen Liang, Cheng Xiaojun, and Teng Hui were all interrogated by Chen Guan personally, and through their mouths, Chen Guan already had a preliminary understanding of the little gangster "Xiao Qiang" in his mind, and he suddenly had an idea, that is, to give a simulated portrait of the little man "Xiao Qiang" to facilitate his pursuit.

At this time, due to the large-scale investigation of the public security of Qin Province and the public security of Mingshui in the previous period, many backlog cases were cracked, including the cattle theft case and theft case in Tonghua Town, and the perpetrators of the large-scale investigation and arrest were all arrested in the large-scale investigation and arrest, not only the social security situation in Mingshui, Sangyuan, and Linguan areas has improved significantly, but the public security situation in the entire Qin Province has been greatly improved. Those traitors who were lucky enough to slip through the net were so frightened that they hid.

The gangsters in the "10?20" series of robbery, rape and murder cases seem to be hiding, and if they want to find them and arrest them, they can only rely on technical investigation skills to solve this case!

Chen Guan wants to give a simulated portrait of the little man's main culprit "Xiaoqiang", in fact, he wants to use technical investigation methods to promote the early detection of the case!

Simulated portraits are a time-honored method of technical investigation. As early as the Spring and Autumn Period, King Chuping killed Wu Hao's entire family, and only Wu Hao's second son, Wu Zixu, escaped. In order to catch Wu Zixu, King Chuping ordered someone to post Wu Zixu's portrait on the city gate to facilitate arrest, which is why Wu Zixu passed Shaoguan overnight.

In the Tang and Song dynasties, the government often used sea fishing documents when arresting fugitives, which often included the names, ages, places of origin and physical characteristics of the fugitives, as well as portraits of fugitives, that is, "shadow graphics" for the officials and citizens to identify and arrest.

This traditional way of hand-painting the simulation of the portrait, time-consuming and laborious, not easy to modify, the quality of the portrait expert is also high, both proficient in sketching and portrait, but also have to have criminal investigation practice, only a few experts can do it.

Analog portrait technology has been developed to the present, and it has been combined with computer technology. The simulated portrait technology in the United States and European countries has developed from the ordinary "portrait combination method" that was popular in the 40s to the portrait combination instrument and electronic imager in the 60s and 70s, and now a computer portrait combination system has been developed. It is a pity that the technique of computer simulation portrait is not yet available in China, and the most advanced in China is the "portrait combination method" of manual combination, which needs to go to the Tianjin Criminal Department and the Chongqing Criminal Department, and the method they adopt is to classify the portrait photos according to the facial features, cut and paste them on the template, and let the witnesses choose the suspect's facial features template, and combine them to get a photo similar to the suspect.

The Central Plains Public Security Bureau does not have such an expert in simulated portraits, nor does it have the "portrait combination method" of the Tianjin Criminal Science Institute and the Chongqing Criminal Science Institute, so it is a waste of time and unrealistic to bring several suspects to Tianjin and Chongqing.

Chen Guan is not a painter, but he can draw, and the introductory master is a drawing teacher in elementary school, an old private teacher with a very average level, who has long passed away. Chen Guan is highly talented, took a drawing class, and when he was herding cattle, he saw a cow drawing a cow, a sheep drawing a sheep, and he also painted a decent one. Later, when he went to university, Chen Guan went to the library in addition to classes and work-study, read many books introducing painters and famous paintings, read Chinese art history and Western art history, and learned some theoretical knowledge of painting. This is where Chen Guan had the confidence to imitate after seeing the authentic handiwork of the old man Xu Wei hanging in the living room of Miss Bai Xuerong in the Bai family's compound!

In addition, Cangshengyin instilled a large amount of information and knowledge when he washed the marrow of Yi Jin, and now Chen Guan wants to pick up a pen and splash ink to paint, it is not troublesome! Moreover, Chen Guan has been a policeman for 4 months and has solved several cases, which can be regarded as an expert. Like the person he conceals who can both draw and work as the head of the police station, in the Mingshui public security system, and even the Shuiquan public security system, it is unique!

Chen Guan bought an easel, paper and pen in Mingshui City, and first drew eight face shapes, including square, flat square, upper and lower shape, large upper and lower shape, upside down large, upside down long, top and bottom cut, flat and broad, and pointed up and down according to the eight face shapes proposed by Wang Duo, a great calligrapher and painter of the Yuan Dynasty, and dozens of different hairstyles, face shapes, eyebrow shapes, eye shapes, nose shapes, ear shapes, mouth shapes, and beards as references.

Next, Chen Guan spent a whole day interrogating Bi Xicheng, Chen Liang, and Cheng Xiaojun, asking them to say the appearance of "Xiaoqiang", comparing the eight face shapes and different facial features they had drawn, and letting Bi Xicheng, Chen Liang, and Cheng Xiaojun choose face shapes and facial features similar to Xiaoqiang.

After the interrogation, Chen Guan had a clearer understanding of the overall shape of "Xiaoqiang"'s face, and then focused on studying and analyzing the right side of "Xiaoqiang's" face, then the left face, and then the upper and lower halves of "Xiaoqiang's" face.

The foundation is too solid, and as soon as the sketch is drawn out, Bi Xicheng, Chen Liang, and Cheng Xiaojun looked at it separately, and they all said that it was like a picture, and after some minor modifications, Bi Xicheng, who had already been seen by Chen Guancheng, was trembling when he saw it, saying that this is definitely the portrait of "Xiaoqiang"!

It's okay now, with a height of 1.58 meters, Zhou Zhi and a group of people in Qin Province, about 30 years old, who served as a soldier in Yunnan, and has a simulated portrait, and if the gangsters run away, it is really better to go home and sell sweet potatoes!

Tan Qi, Zhang Shemin, Jiang Lixin and others couldn't imagine that Chen Guan still had this ability, and after looking at the simulated portrait, they shouted happily! Tan Qi immediately reported to Director Shang Yushan of the Municipal Bureau and Deputy Director Wang Xuewen of the Provincial Department, saying that Chen Guan had drawn a simulated portrait of the main culprit "Xiaoqiang", which was identified by the arrested Bi Xicheng, Chen Liang, and Cheng Xiaojun, and looked the same as "Xiaoqiang", and asked the provincial department and the municipal bureau to report to the Ministry of Public Security and coordinate the Qin Provincial Public Security to cooperate with the search!

Wang Xuewen and Shang Yushan both instructed Tan Qi on the phone to quickly remake the simulated portrait and print more, in addition to sending it to the Mingshui police officers who went to Zhouzhi to carry out the search and arrest task, they should send it to every police station in Zhouzhi County, asking them to cooperate with the search!

Chen Guan's simulated portrait was quickly photographed and rinsed, Tan Qi personally led the team, the criminal police brigade was all dispatched, and the Tonghua Town Police Station dispatched Chen Guan, Li Tong, Lei Zhimin, Zhang Wenyuan, and Mao Feng Five police officers went to Zhouzhi to search for "Xiaoqiang".

The strange thing is that the Zhouzhi Armed Forces Department did not find the discharge file of "Xiaoqiang", and after the township police stations got the simulated portraits, after investigation, they reported that "Xiaoqiang" was not from their own jurisdiction.

It's already December 12th, just after the heavy snow in the twenty-four solar terms, the snow on the ground in Guanzhong is fluttering, and the snow is covered in silver.

Tan Qi, Chen Guan and others rushed over, not only did they not find the main culprit "Xiaoqiang", but they were also trapped in Zhouzhi County, the road was closed by heavy snow, and the car could not run, so they could only accompany the comrades-in-arms of Zhouzhi Public Security to eat hot pot and drink wine.

Chen Guan thought about it and felt that several murderers confessed that "Xiaoqiang" was very familiar with the Taoist temple of Louguantai, and he came to participate in the temple fair every year, and he should be Zhou Zhi and his family. Since Zhou Zhi couldn't find his traces, he had to expand the scope of investigation and investigate the counties around Zhou Zhi. It's really not good, expand the scope and look for it in Shaanxi Province, there will definitely be clues!