"Did you find any chemical composition on it?" I asked.

Jiang Jun nodded and replied, "Ethanol was found." ”

Sure enough, as I expected, the fingerprint marks on the drawing paper were obviously cleaned up.

In terms of residual morphology, fingerprints are divided into three categories. The first type is obvious lines, which are lines that can be seen visually, such as handprints made by hand stained with paint, blood, ink, etc.; The second type is the molded pattern, such as the handprint found on candles and clay embossed by hand contact; The third type is latent fingerprints, which are the fingerprint patterns formed by the transfer of natural secretions such as sweat from the body, which are not easy to find visually, and are the most common form of fingerprints in the crime scene.

If you want to erase the latent fingerprints on the drawing paper, you can do it by gently wiping it with alcohol several times, and after a long time, it is difficult to find the fingerprints with only the existing scientific and technological means. Ethanol is the main component of alcohol, and it is this how fingerprints are erased.

Obviously, the pencil pattern on it was drawn after the fingerprints on the paper had been cleaned up, otherwise the alcohol would have wiped the pencil traces away. The person who wiped the fingerprints on it was very delicate, such a thin piece of paper was not destroyed by alcohol, you can imagine how much energy the other party spent on it.

Jiang Jun asked me what to do, although there was not much hope, but now I can only let the people in the identification department work harder to see if they can restore it.

Jiang Jun has asked many relevant people, and everyone does not know that Zhou Xiaoruo has a talent for painting, so Jiang Jun dares to speculate with such certainty that the painting was not painted by Zhou Xiaoruo. No matter who drew the painting, since it is sandwiched in Zhou Xiaoruo's textbook, the school is the most likely place to find clues, because according to the distance and time, Zhou Xiaoruo has always returned home as soon as he gets out of school.

In the end, we decided to send someone to the school to investigate and find out the source of the painting.

Jiang Jun and I were going to secretly follow up with Zhou Guang's family, and their suspicions were even greater. Zhou Xiaoruo has a good relationship with them, it is impossible not to open the door for three consecutive days, there is a reason for the incident, which may be inextricably linked to Zhou Xiaoruo's disappearance.

Wang Xin has been silently watering the plants, and he has heard our analysis, but he still has no opinion.

In order not to arouse the suspicion of Zhou Guang's family, the three of us didn't dare to bring anyone else, and Xu Yi also changed into sneakers to make it easier to walk. Last night, Jiang Jun sent someone to watch Zhou Guang's family, Zhou Guang's family went home after going out of the police station, early this morning, they first drove Zhou Xiaoyu to school, and then the two of them went to their own factory, and never went out.

After we came to the outside of the factory, we replaced the criminal police who had been guarding all night, and before leaving, they told me that the factory was very formal, and they had checked it, and there was nothing wrong with the factory.

The sun was very strong, so we found a shade to sit on, and kept watch for most of the noon, and Zhou Guang and his wife did not come out again. The weather was hot and humid, the three of us were sweating profusely, and Xu Yi's face turned red. Just when Jiang Jun questioned the correctness of our actions, they finally came out.

They got into the car, and the three of us quickly got into the car, and as soon as they drove we followed.

The car drove for a long time, and finally drove out of the city, and I felt even more that something was wrong, this place was very remote, and they shouldn't come to such a remote place even if they went out to talk about business. We didn't dare get too close, and on several occasions we almost couldn't keep up with them, and finally, after a few corners, we found that their car was gone.

"Could it be that they found us?" Jiang Jun stepped on the brakes and asked us.

The car had already driven to the outskirts, the road was steep, but it was wide, and they couldn't have driven away from us so quickly.

"I don't know, let's get out of the car and look for it." At my suggestion, the three of us got out of the car. Surrounded by a dense grove, we finally found the car of Zhou Guang and his wife after some searching. They pushed the car under a tree, but their people weren't in the car.

We walked down the grove, there was a trail in the woods that cars couldn't drive into, and we guessed they were walking on the trail. We quickened our pace, and finally, we spotted Zhou Guang and his wife, they were right in front of us, they were walking very slowly, looking around as they went, as if to see if anyone had spotted them.

"Sneaky, there must be a problem." Jiang Jun said in a low voice.

As he said this, Zhou Guang suddenly turned around, thanks to the fact that we hid behind a tree in time to be undetected. Now we became more vigilant, and it took us more than twenty minutes to follow them through the grove.

Walking out of the grove, a large factory appeared in front of us, which was very dilapidated and looked like an abandoned factory. Zhou Guang and his wife looked around again to make sure that no one was following them before they entered the factory gate.

Jiang Jun immediately wanted to follow, but I grabbed him because I found that Xu Yi's reaction was a little abnormal. Xu Yi stared at the door of the abandoned factory tightly, his lips trembled slightly, I asked Xu Yi what was wrong, she said she didn't know, but suddenly felt very tight in her chest, I had a very bad premonition in my heart, looking at this abandoned factory, I suddenly felt a little familiar, as if I had been here before.

"Professor Li, if you don't go in again, you're likely to miss something!" Jiang Jun urged.

There is no doubt that Zhou Guang and his wife must have something unsightly, Jiang Jun is right, if we don't go in, we are likely to miss something. I thought about it and asked Jiang Jun to contact the people in the police force first.

Jiang Jun immediately called the police and told them where we were. We are slowly approaching the abandoned factory, and we have already agreed that before the police arrive, even if we really find anything, we will not act rashly, and if anything is wrong, we will withdraw immediately.

Walking to the gate of the abandoned factory and looking in, it was dark and oppressive, Jiang Jun took out his gun, took the lead and slowly paced in. I took Xu Yi's hand and followed Jiang Jun.

As soon as we walked into the abandoned factory, a sour smell of garbage hit our noses, and the factory was so dark that our visual range was not even a few meters. The ground of the abandoned factory was full of standing water, and we carefully stepped on the ground so that the footsteps did not resound in the quiet factory.

The water pipes in the factory seemed to burst, and we kept hearing the sound of water squirting and dripping down. The factory was so big that we hesitated outside for two minutes, and Mr. and Mrs. Zhou didn't know where we went. As we got farther and farther away from the gate, the road beneath our feet grew darker and darker.

Several times we almost tripped over something, and Xu Yi's gasps grew more and more cramped, and her cold hand clutched mine. After entering the abandoned factory, I understood better why I was so familiar with this factory, and why Xu Yi was suddenly so restless.

The environment of this factory is too similar to the factory that appeared in my dream and the place in Xu Yi's vague impression. The years of Xu Yi's disappearance gave Xu Yi too heavy a psychological shadow, so she was so abnormal.

Li Ke...... I feel like this place, like I'm stuck in......" Xu Yi said to me in a low voice, crying in her voice.

As soon as Xu Yi spoke, Jiang Jun and I stopped. I put my arm around Xu Yi's shoulders, and after thinking about it carefully, I decided to take Xu Yi out of this place, I couldn't make Xu Yi uncomfortable anymore. This place is indeed very strange, and when the criminal police team arrives, I will definitely come in and investigate again.

Just as we were about to turn back, we suddenly heard the sound of a cough, which echoed through the empty factory for several seconds before stopping. Immediately, a point of light appeared dozens of meters in front of us, swaying from side to side.

We squinted and looked carefully for a long time before we could vaguely see that it was a candle, and there was a person holding a candle and slowly walking forward. He was facing us sideways, the candlelight flickering, too far away for us to see who he was. He didn't seem to notice us, and continued to walk leisurely.

He walks in a strange way, the candlelight only illuminates his upper body, I don't know if it's an illusion, I feel as if the person is floating, and he, without the lower body......