"The footprints on the ground are supposed to have been left by skateboard shoes." Qin Ranran said, picked up a few pairs of shoes by the door and looked at them, "It's strange." ”

"How?" Wu Dao looked at the shoe in her hand, the soles of which were stained with ketchup.

"There are two kinds of footprints, one should be Erhei's, and the other should be a suspect, but these shoes are also stained with ketchup, do Erhei have to change his shoes before jumping off the building? If the pair he was wearing when he had an accident also had ketchup, then this pair should have been worn by the suspect at the time of the crime. Qin Ranran analyzed.

With this doubt, Guo Rebellion dialed Zou Lianya's phone, and the skateboard shoes that Erhei was wearing when he had an accident were also stained with ketchup.

In this way, the suspect should be a person with a certain anti-reconnaissance ability, in order to reduce the traces he left in the room, he not only covered up his fingerprints, but also deliberately changed into two black shoes.

"Guo Wan'er, did Erhei say what he wanted to give you at that time?" Wu Dao turned his head to look at him.

Guo Rebellion shook his head solemnly, "No, he said half of his words, let me wait for him downstairs, I knew that I should come up with him." ”

Ding-ding-clang.

There was a sound of renovation at the door.

Wu Dao glanced at the opposite door, "Perhaps, we can ask them if they heard something." ”

They knocked on the opposite door, and the renovation workers were tearing down a wall and drilling holes, and the noise was very loud.

After learning of the intention, the workers all gathered around and inquired about what had just happened.

Obviously, they didn't know what had just happened.

In this group of people, Wu Dao saw a familiar face, it was Wu Qiong.

He recognized Wu Dao, smiled rustically, and gave him a cigarette, "I didn't expect to meet here." ”

Wu Dao lit a cigarette, "Aren't you at the construction site?" Why did you get here? ”

Wu Qiong scratched her head, "Don't you also want to make more money and go home early to marry your daughter-in-law?" Sometimes I carry the foreman on my back and rely on my fellow villagers to introduce some work. ”

"Did you hear anything just now?" Wu Dao called him aside.

Wu Qiong shook her head honestly, "I didn't hear it, I was punching with Daqiang just now, and now the eardrums are still buzzing, and the houses in this city are soundproof, and there is no movement on the other side." ”

After speaking, he took a puff of cigarette, "A few days ago, I saw Sister Dabao, who seemed to be shopping for groceries, and wanted to contact you, but I lost the phone number of the female police comrade, and then I forgot about the deadline." ”

"A few days ago, the Guo family came to confirm the identity of the deceased...... Wu Dao extinguished the cigarette, "We still have something to do, let's go first." ”

Back in the office, Wu Dao and they got good news, Erhei had just passed the dangerous period, although there was a comminuted fracture of the left limb, but his head was not too traumatized, and everyone was looking forward to him waking up quickly to provide some clues about the suspect.

Qin Ranran found Xiao Wang of the criminal police team and called a group of people to do experiments.

She found a pair of skateboard shoes that were exactly the same as Erhei, handed them to try on, dipped some dye and walked back and forth on the white cloth, then put the cloth away, carefully looked at the video materials just tested, and analyzed everyone's walking posture and shape.

The final conclusion is jaw-dropping.

Each person is an individual and will have many differences in behavior, even if they are twins, they may behave exactly the same.

Human footprints are also unique, foot, support, foot have habitual characteristics, only need to observe carefully, skillfully grasp the calculation formula coefficient, whether it is a plane footprint or a three-dimensional footprint as long as through a certain conversion, you can get some clues to leave footprints.

Qin Ranran compared the footprints at the scene, which was characterized by the backward movement of the heavy pressure point, the edge of the footprint was incomplete and there were many imaginary edges, which obviously belonged to the characteristics of small feet wearing big shoes.

Among the police officers who were just invited to cooperate with the experiment, there happened to be a few small feet wearing big shoes, Qin Ranran quickly arranged for them to simulate again, and the footprints of one of the police officers were relatively close to the scene, and his height, weight and age also became an important reference value for the portrait of the suspect.

"The suspect is a male, with a single step length of about one hundred and forty-five, which should be regarded as the average short level among men, about one meter seven, slightly fat, should be around one hundred and fifteen, young and middle-aged."

Wu Dao suddenly remembered the inference Qin Ranran had made after discovering the drop of blood in the sewage pipe.

"In this way, the one who pushed Erhei down from the upper floor is the same person who killed Dalong."

"Yes, their parameters are very close." Qin Ranran said with a serious face.

However, there was one thing they hadn't thought too clearly, that is, what the hell was that Dalong handed over to Erhei, and if they didn't figure it out, they wouldn't be able to find it at all.

In the current situation, although the characteristics of some suspects have been mastered, as a large country with a population of more than one billion, there is no way to achieve database management whether it is blood DNA, fingerprints, footprints, etc., but it is only after locking the scope of several suspects that it is convenient to make a final decision and determine which one is the perpetrator.

The case seems to have some clues, but the breakthrough in the investigation has not been shown for a long time, which makes everyone feel frustrated.

Guo Rebellion blamed himself a little, he was a person who was very strict with himself, and he couldn't imagine that the suspect in charge of stalking had an accident under his nose, he couldn't accept it, and he was very emotional.

In addition to checking Erhei's condition in the hospital every day, he began to act on his own to find some clues.

Jiang Liu reminded him that it is a good thing to actively handle the case, but it is easy to make trouble if it is too urgent, so it is better to be careful.

Guo Rebellion suddenly received a notice from the hospital, and Erhei showed signs of waking up briefly.

When he rushed over, Erhei fell into a coma again, he asked the medical staff who were present at the time, Erhei repeatedly chanted two words, one is a book, and the other is a legend.

In the office, everyone began to solve the puzzle around the two words given by Erhei.

Book,It should refer to what Dalong gave him for safekeeping before.,It's probably the appearance of a notebook.,As for the legend.,Everyone is a little puzzled.。

Wu Dao suddenly remembered a person, that is, when checking Guo Dabao's QQ records, there was a netizen called 'Legend', who almost cheated Guo Dabao out of his money, and finally blocked Guo Dabao.

The case turned around, and Jiang Liu asked Ling Hai to coordinate with the people in the technical department and go all out to find out the person of 'legend'.