Xu Yi finally felt that the situation was wrong that day, and we thought about the scene of the day carefully. The four girls were in front of us, startled, and from time to time they looked around, and one of them screamed in horror as she looked at a patch of grass. But I looked around and didn't see anything unusual.

While we were discussing, my mother came out with a meal and didn't want her to know about the bloody case, so we all kept silent. I took a few bites of food, felt that I had no appetite and went back to the room, and after a while, Xu Yi followed in and asked me if I was uncomfortable, I shook my head.

Xu Yi told me not to be too tired, saying that I don't need to take all cases, people die unnaturally every day, and I can't take on so many cases. Xu Yi complained about the school's approach, saying that if it was a case that the police force and the police academy could not solve together, they would come to me again, but the body had just been found, and the school asked me to go to the crime scene before dawn, which is really incomprehensible.

I nodded and said I hoped that the City B police team would solve the case so that I wouldn't need to get involved too much. I was already anxious, and I was determined that I would only help when I needed help, and with the ability of the B City Police Force, it should not be very difficult to solve a case, and the holiday was coming to an end, and many experts from the police academy would also return to school.

While I was thinking this, my mother called me in the living room. Xu Yi and I stood up and walked out, and someone looked for me, and the person said that he was sent by the leader of the police academy. He brought me news that another roommate of the three deceased could not be reached and called home, and relatives also said that she had not returned home.

He handed me a page, a student file, with a picture on it, and I glanced at the photo and was sure that it was the other girl that Xu Yi and I had seen that day. They were acting strangely, so I remember very well that the man said that the fourth girl might have had an accident.

He said that because of such a major case, the students who had a good relationship with the deceased were called back to the police academy in advance, and they are now on their way back. The school's leaders also issued an administrative order for the police academy's experts to rush back ahead of schedule, which is said to be the reason why the preliminary appraisal results had little effect on the breakthrough of the case.

The police of City B and the experts of the police academy jointly set up a special task force and vowed to solve the case in the shortest possible time. The school and the police did not deliberately block the news, because when the victims' relatives made a fuss, the news could not be hidden, so only by solving the case as soon as possible could the dignity lost by the brutal murder of the three police academy students be restored.

The work room of the task force is located inside the police academy, which has an appraisal center and many expert resources, and it is also convenient to investigate the situation with the classmates of the three deceased. I thought about it and went with him to the appraisal center.

When I arrived at the identification center, many experts from the police academy had already rushed back, and Wen Ning seemed to be more willing to communicate with them than me. When I walked in, Wen Ning didn't greet me, but pretended not to see me and continued to discuss the case with other experts. The man who brought me here brought me a stack of documents that were preliminary autopsy reports and identification reports.

I flipped through it, and the forensic doctor confirmed that the three deceased had died no more than twelve hours after death, that is, at the time of the previous night, and as for the cause of death, the forensic doctor concluded that the throat had been punctured, which had no way out from my guess. I continued to scroll down, and I wondered more about what the green muddy goo was that had been smeared under the eyelids of the three corpses.

The forensic doctor at the scene guessed that it was corpse mud, and sure enough, the identification results also showed that the green goo was a mixture of corpse oil and mud. When the corpse is highly decomposed, the fat flows out in the form of oil, which is called corpse oil, which is generally easy to produce on obese corpses.

The medical examiner also carefully examined the bloody wounds on the bodies of the three deceased, ranging in depth and shallowness, with an average depth of three centimeters. Importantly, the forensic doctor detected the residue of pen ink at the wound. Seeing this, I already had a score in my heart, if it was repeatedly pierced with a pen, the wound would indeed be that uneven tear and leave ink residue.

Depending on how old the traces were, the appraisers found the footprints of five people inside the farmhouse. Through the shoes of the three deceased people and the shoes of Geng Fufu, the owner of the farmhouse, four footprints were found, but there was still one person's footprints that had not yet been found.

Seeing this, I frowned. The three deceased walked around the house, they would definitely leave footprints, Geng Fufu had also been in and out of the farmhouse yesterday and early this morning, so one of the people's footprints was his, but there was another person's footprints, most likely the murderer's.

The killer may have been a girl, and I immediately thought of the roommate who the three deceased couldn't reach. I thought of it, and the police naturally thought of it. I was told that they had found another girl's shoes from the deceased's dormitory, and that the examiners were comparing them.

I glanced towards the laboratory, and the door was still closed. Wen Ning was still discussing with several other detectives and experts, and I continued to flip through the materials in my hand.

I brought back some things from the scene, and the one I cared about the most was the pencil and the drawing paper on the table. So far, no one has speculated on the meaning of the messy things written on the drawing paper, but on the pencil, many fingerprints were found, and those fingerprints overlapped, and there were several different five-finger fingerprints, which was extremely difficult to identify.

After eliminating the difficulties, the appraisers preliminarily determined that these were the fingerprints of four different fingers. Since the palms and soles of the hands and feet of the three deceased were all intercepted, there was no way for the appraisers to directly determine whether the fingerprints belonged to the three deceased, so the police used the same method as the identification of the footprints, and went to the deceased's dormitory to extract the fingerprints left by the four people in the dormitory. Fingerprint comparison is also underway, and the results will not come out for a while and a half.

If you exclude the footprints left by Geng Fufu in the house, whether it is footprints or fingerprints, they are all four people. Everyone can faintly feel that three of the traces were left by the three deceased, and the last one was probably left by the murderer.

I saw the last identification report, which was the identification of DNA and blood stains from the scene. DNA traces can be extracted from bodily fluids or hair, and many different DNA traces have been found at the scene. DNA traces are not easy to destroy and can be retained for a long time, which makes it extremely difficult for the police to investigate.

I don't know how many people have rested in the farmhouse, and Geng Fu doesn't clean it often, so there are so many DNA traces in the house, and it can be said that it is difficult to find everyone through DNA. The function of DNA traces is generally used to confirm whether the suspect suspected by the police appeared at the scene of the crime or had contact with the deceased.

As for the identification of the bloodstains, it is very clear, the bloodstains at the scene are all three deceased.

I put down the appraisal report, and at this time, the discussion between Wen Ning and those people also reached an impasse, and everyone bowed their heads and pondered. No one left, everyone was waiting for the door of the laboratory to open. Time passed minute by minute, until it was almost dark, and the appraisal personnel had not yet come out, so you can imagine how difficult the appraisal was.

At this time, the leader of the school came in and brought a box lunch to everyone. Many people haven't eaten all day, and they take the lunch box and gobble it up. The leader held my hand and secretly said that although many experts had returned, he still believed in my ability and told me to pay more attention to this case.

He said that several family members of the deceased were on their way and that we had to solve the case as soon as possible so that the matter could be calmed down. I had a slight headache, tomorrow is Meng Ting's wedding, and when I didn't know how to answer, several criminal policemen knocked on the door.

The criminal police were accompanied by several female students, and upon questioning, they learned that these were all students who had been called back early by the school, and they all lived in the dormitory next door to the three deceased. In the process of questioning, the criminal police found an abnormality, so they brought the female students back.

At Wen Ning's urging, a female student hesitated, saying that the four people in the dormitory where the deceased was staying were discussing playing with the pen fairy before leaving the school during the holidays.

Pen fairy, when I heard these two words, I immediately remembered the pencil and the blank paper on the table......