Although he lost the first round of the duel, the direction of the case was not as bad as Xu Tian thought, and after discussing the case with Dr. Lin, Xu Tian took a short break.

At 4:12 p.m. that day, Xu Tian was woken up by the police, and the case occurred again in the apartment building that had been checked in the morning.

Since it was not yet the rush hour and there were relatively few people staying at home, the police immediately sealed off the apartment and began a full-scale investigation of the murderer.

This time the case took place in an apartment on the third floor, and the victim was not the owner of the room, and this time the victim was also discovered during the routine patrol of the security guards.

According to the security guard, when patrolling to the third floor, he found that the door of the victim's room was not closed, and the security guard knocked on the door twice out of a responsible attitude and asked if there was anyone inside.

The scene of the crime was a small apartment, and the inside of the bedroom could be seen from the door, and the security guard saw the victim lying in the bedroom, and the security guard only saw the victim's feet, and the victim's body was blocked by the bed.

The security guard thought that something had happened to the head of the household, so he hurriedly ran in to take a look, only to find that the victim had died in the room.

Later, the security guard called the police, and with the cooperation of the property manager, the police found that the victim was not the head of the household, so the police contacted the head of the household.

When the head of the household went home to identify the victim, the head of the household also said that he did not know the victim, and then the police began to compare the appearance of the victim on the Internet and found that the victim was a thief who had not been released from prison for a short time.

The police who found out that there was something unusual in the case immediately woke up Xu Tian, and this is what happened roughly.

Xu Tian, who hadn't woken up yet, got into the police car with a dizzy head, and when he arrived at the scene of the crime, Xu Tian felt that his mind was very cloudy, and Xu Tian's body, which had not rested for several nights, was overloaded.

"How's the on-site investigation?" Xu Tian asked the police.

"There is no trace of the crime scene being turned over, because there are many shops opposite the crime scene, we have checked, and the victim has not appeared in the camera, but the camera in the apartment has not found the victim to appear." The police said.

"What's going on? Could it be that the victim showed up in this apartment a long time ago? Xu Tian said suspiciously.

"The preliminary investigation results are like this, we suspect that the victim entered the apartment a long time ago, because the surveillance video of the property is not long away, so we can only find it here." The police said.

"So are there any traces of the victim's life at this crime scene?" Xu Tian asked.

"No, we only detected the victim's fingerprints on the doorknob, and we also found a set of lockpicking tools in the victim's pocket, all kinds of signs indicate that the victim walked into the room with a lockpicking tool." The police said.

"So what was the cause of the victim's death?" Xu Tian asked.

"Suffocation, according to preliminary testing, the victim was covered with his mouth and nose covering and died of suffocation." The police said.

"Such a straightforward way to kill? Were there any other traces detected at the scene of the crime? Xu Tian asked.

"In addition to these clues, we also detected the victim's palm print on the bedside table in the victim's home, when the victim should have pressed one palm on the bedside table, and the others were gone." The police said.

Xu Tian glanced at the bedside table in the bedroom, this room is facing south, the bedside table is close to the windowsill, there is a distance of about half a meter between the bed and the windowsill, and there is also a distance of about ten centimeters between the bedside table and the windowsill.

According to the victim's palm prints detected by the police, the victim should have been standing in the 10-centimeter gap between the bedside table and the windowsill, and the victim was obviously hiding in the gap and looking outside, but because the gap was relatively narrow, the victim accidentally fell down, and as a result, his palm pressed on the bedside table.

Xu Tian walked into the gap and tried to look outside, standing there and looking outside, the perspective was quite wide, he could see several shops, the road in front of those shops was also relatively clear, and he could also see some of the ground floor windows of the opposite building.

"It is possible that the victim was in this room looking at something or someone opposite, but why was the victim covered in this room? Can this resident be ruled out of suspicion? Xu Tian asked the police.

"Residents can be excluded, we have seen the surveillance video of the residents here in the unit, and all day today, the residents are working in the unit, and there are human and physical evidence." The police said.

"Then it is necessary to investigate the people who stayed in this building, and like the two deceased people found in the early hours of this morning, it is very likely that the people in this apartment committed the crime." Xu Tian said.

"Based on the previous two cases, we have found two common points." The police said.

"What are they?" Xu Tian asked.

"First of all, the victim was found inside the plumbing valve on the top floor, and the victim here, and the person who found the two bodies was the same person, the patrolling security guard. Another common denominator is that one of the suspects we identified this morning had stayed at home and not left the house today. The police said.

"Is that the woman who just moved in?" Xu Tian asked.

"That's right." The police said.

"What about the security guards? Aren't the security guards off duty? Xu Tian asked.

"According to the statements provided by the security guard and the property manager, the security guard who found the deceased twice was supposed to work a night shift yesterday and should have been off during the day today, but the security guard helped his colleague work a day shift, and that's it." The police said.

"It's really a coincidence, a body was found on both the night shift and the day shift, so what about the traces of on-site testing? Are there any traces of anyone other than security guards? Xu Tian asked.

"There were only traces of the head of the household and the victim at the scene of the crime, and none of the fingerprints of the security guard were detected, because the room was open when the security guard found the body, and the security guard immediately reported the crime after he walked in and saw the victim lying in the bedroom." The police said.

"What about shoe prints? Didn't detect it either? Xu Tian asked.

"The security guard was wearing canvas shoes, the soles had no lines, we checked the soles of his shoes, the lines had been smoothed, and the shoes looked like they had been worn for a long time." The police said.

"The current technology should be able to detect the shoe prints of security guards, right?" Xu Tian asked.

"The test was detected, unfortunately, the security guard's shoe prints were very neat, and he did not step on the crime scene, and according to the arrangement of the shoe prints, the security guard's murder suspicion can almost be ruled out." The police said.