Qingquan County, belonging to BZ City, is located at the junction of BZ City and Tianzhou City, with many mountains, hills and few plains.

The area of Qingquan County is not large, with only 780,000 permanent residents in the urban area, and less than 300,000 in the county with the rural population.

But Qingquan County's economy is not lagging behind. Because of its mountainous terrain, Qingquan County has formed a unique microclimate that is different from other places.

It is humid and rainy all year round, the plants in the mountain are lush, and there are many kinds of animals, making it a well-known tourist summer resort.

Not only that, Qingquan County has been rich in herbal medicine since ancient times, and the towns and villages in the county are all famous herbal medicine planting concentration areas and distribution centers.

There are many vendors coming and going, and there are also many locals collecting medicine in the mountains. A group of Yumin Village, Changchun Town, Qingquan County. Outside the courtyard of a farmhouse in the west of Tunzi, police cars with shining police lights are parked.

Around the police car, more than 50 local farmers were watching. In the courtyard is a three-room brick house, each with two east and west wings, a barn on the east side and a cattle pen on the west side.

In the room, Lu Chuan was doing a scene survey. There are two corpses on the kang, a middle-aged female corpse horizontally, and a middle-aged male corpse vertically.

The corpse was fully clothed, and the neck of the male corpse had been severed by a sharp weapon, with only a trace of flesh and skin attached. The blood sprayed was more than two meters high, and there was a brown stain on the ceiling.

The female corpse's head was covered in black blood, lying horizontally on the edge of the fire. The ground was covered in dried blood, and the same was true on the walls.

Li Donglin stood outside with a pale face, looking at Lu Chuan who was busy inside through the window on the stove.

This is the third homicide discovered by the task force recently. In December, after the murder of Song Kun was solved, Wang Liang, Chen Gang, Wang Manli, and a surgeon from the First People's Hospital of BZ City were arrested one after another.

I thought that this was the end of the case, but who would have thought that this was the beginning of everything. First, Wang Liang's wife was found dead at home on the fifth day of Wang Liang's arrest.

Knife wounds, fatal with one blow. On January 3, Chen Gang's uncle in BZ City was found dead in an underground garage.

Wounded by an axe, with a fire axe, a fatal blow was made, and a hole was cut in the chest. Today, January 7, Zhao Dong and his wife, who had a herbal medicine trading business, were found dead on their own kang.

"We go to the mountains every Wednesday to collect medicine, and I didn't see Lao Zhao this morning, so I came to his house to look for him...... Unexpectedly......" it was Zhao Dong's neighbor Sun Zhiyou who reported the case, and he also grew up from childhood to adulthood, from big to old.

The two often go up to the mountains together to pick herbs and then come back to sell them.

"Haven't you usually been in touch?" It has not been a day or two since Zhao Dong was killed, the blood on the ground has dried up, if it weren't for the fact that it was winter, the corpse would have rotted long ago.

"Over the years, the part-time workers who went out to work in Tunzi and the university entrance examination have left more than 20 families in Tunzi now." Sun Zhiyou is nearly 60 years old, and he has been farming all year round and working hard, making him look at least 70 years old.

"Lao Zhao and I are the youngest in the tunzi now."

"Usually except for collecting medicine, there is usually nothing to do, and it is quite common not to see each other for three or five days." The person in charge of questioning Sun Zhiyou was Chen Kang, a criminal police officer of the Second Criminal Investigation Division of the Provincial Department, and Li Donglin's subordinate: "When was the last time I saw him?" ”

"Two days ago, the morning before yesterday, I saw him fodder for the cows." The outside inquiries did not affect Lu Chuan's current survey.

"Ding!"

"Advanced mission: Complete a routine on-site investigation, combine three homicides, find valuable clues, and assist the task force in solving the case." After these several investigations, Lu Chuan is basically certain that the murderer who killed Zhao Dong and his wife, and the murderer who killed Wang Liang's wife and Uncle Chen Gang should be one person.

The other party's methods of committing the crime are quite neat. Judging from the traces of the murder at the scene, the murderer and Zhao Dong and his wife should know each other.

When Zhao Dong was killed, he sat cross-legged on the kang. His wife sat on the edge of the fire. The murder weapon used by the murderer was Zhao Dongjia's kitchen knife.

A knife slashed Zhao Dong's neck, which was directly fatal. Later, when Zhao Dong's wife wanted to escape, he slashed Zhao Dong's wife's head with a kitchen knife.

The killing was clean and neat, without the slightest hesitation. If the scene can be restored, the murderer should have directly picked up the kitchen knife on the stove after entering the door, entered the inner bedroom, and killed people directly.

At the same time, this person illegally paid attention to self-protection, wore gloves when committing the crime, did not leave any fingerprints, but there were footprints, which were consistent with the footprints at the previous two scenes.

Now that he is surveying and taking photos and collecting footprint information, Lu Chuan feels that the work he can do is limited. Because, such work, he has done both sides.

The first time was to revisit the scene of Wang Liang's wife's murder. The second time is to investigate the scene of Uncle Chen Gang's murder. This is the third time.

"How's it going?" Lu Chuan's performance in inspecting the basement of Chen Gang's house in BZ City, as well as the fingerprint identification analysis and physical evidence analysis he did later, were all seen by Li Donglin.

After returning to the provincial hall, Li Donglin deliberately checked Lu Chuan's information again. This check doesn't matter, it really shocked Li Donglin.

What shocked Li Donglin was not that Lu Chuan became a regular as soon as he joined the police, nor was it the third-class meritorious medal. It is Zhang Yuanchao's evaluation of him.

Lu Chuan is not only proficient in field investigation, fingerprint identification and analysis, but also proficient in bone identification and analysis. What kind of person Zhang Yuanchao is, what kind of expert, no one knows better than Li Donglin, who is also a technical expert.

To be recommended by Zhang Yuanchao to help the Tianzhou City Criminal Investigation Detachment do skeleton analysis, Lu Chuan's technique is absolutely first-class.

Therefore, Li Donglin asked Lu Chuan by name with the Haizhou City Criminal Investigation Detachment. As he expected, Lu Chuan did not disappoint him.

In the case of the murder of Wang Liang's wife, Lu Chuan determined the basic characteristics of the other party according to his footprints. However, these are not enough.

Taking a deep breath, Lu Chuan nodded heavily: "It's still him." "Or him?! After receiving the information to confirm, Li Donglin's heart seemed to be clenched vigorously and skipped a beat.

The one in Lu Chuan's mouth also seemed to appear in front of Li Donglin's eyes again.

"Male, 1.75 meters tall, weighing about 80 kilograms, aged between 40 and 45 years old."

"Walks in a slight figure-of-eight, right-side slanted shoulder, left-handed." This is the characteristics of the suspect that Lu Chuan judged at the scene of the investigation, combined with the analysis of footprints and the wounds of the deceased.

The analysis of height, weight, and age was relatively simple, and the killer's right foot had heavier shoe prints than his left foot, but there were no signs of leg or foot disease.

It should be that the right shoulder has been under heavy pressure for a long time, resulting in some right oblique shoulder. The wounds of the deceased, the initial wounds are on the left, and the Xi diagonally pulls to the right, which is the only trace that a left-handed person can have with a knife.

And none of the suspects in Li Donglin's possession of this information match.

"Are there fingerprints?" Lu Chuan shook his head: "Like the last two times, the murder weapon used by the murderer is the kitchen knife in the deceased's house or the murder weapon that can be taken nearby at any time." ”

"With gloves on, the murder weapon was directly discarded at the scene, coming and going quickly, leaving no traces of contact except for touching the murder weapon." No matter how awesome the current investigation is, there must be traces of contact between the murderer and the surrounding environment, so that the investigation can be done and it is possible to find clues.

And the other party, except for the murder weapon that was lost at the scene, did not touch anything. Nothing was left but footprints on the ground.