The deceased's name was Qian Gang, who was unemployed in the society and often participated in crowd fights and gambling activities. On the wine glass that the deceased Qian had just drunk, there were obvious fingerprints of three people.

After technical comparison, it was determined that the fingerprints belonged to the deceased Qian Gang, the waitress Xiaoli and the bar waiter Ou Qiang.

The residual liquor in the wine glass, which has been tested to contain the strong chemical potassium cyanide. According to the forensic examination, Qian Gang died of potassium cyanide poisoning.

The two fashionable women who traveled with the deceased were confirmed to be true after multiple investigations by the police.

The two women were just netizens in the same city that Qian Gang met that day, just because of Qian Gang's boasting on the Internet, the two women couldn't resist the temptation of Qian Gang, who liked to look for flowers and ask willows, and asked to come out to accompany Qian Gang to the bar to have fun. Unexpectedly, less than three hours after meeting, there was a murder case in which Qian Gang was poisoned.

After multiple investigations, it was confirmed that Qian Gang and the two women did not know each other before, and the suspicion that they poisoned and murdered Qian Gang was also ruled out.

Obviously, this is a deliberate poisoning murder case, and according to the fingerprints left on the wine glass, the police have targeted Xiaoli and Ou Qiang.

Why kill Ou Qiang? Finding the motive for the murder has become the focus of the police's screening of suspects.

The results of the investigation made Xiao Song quite disappointed, because Xiaoli and Ou Qiang were just staff at the bar, and their fingerprints would inevitably be left on the wine glasses, and they did not have the motive to kill Ou Qiang.

As for Xiaoli's fingerprints, it is because she is responsible for delivering and pouring wine to guests; Ou Qiang, on the other hand, works at the bar, but the bar is open every day, and when there are not many customers, he will also go to each booth to help order drinks and open bottles of wine.

Although these two people were familiar with the deceased Qian Gang, it was only because Qian Gang was a frequent customer of the Black Rose Bar, and they were just familiar with each other. According to multiple investigations, there was no other relationship between the deceased Qian Gang, Ou Qiang and Xiaoli. Therefore, the police ruled out Ou Qiang and Xiaoli's motive for killing.

To Xiao Song's excitement, an IOU was found in the foreskin of the deceased Qian Gang. The amount of money on the IOU is staggering, and it is a huge million.

The police learned that this Qian Gang usually secretly engaged in usury activities. So, could Qian Gang's death be caused by a huge economic dispute?

Based on the name on the IOU and the investigation of Qian Gang's social relations before his death, the police quickly determined the identity of the mysterious person on the IOU -- Ruan Shishi, director of the obstetrics and gynecology department of Renji Hospital.

Xiao Song decided that Ruan Shishi was suspected of murder, so he decided to contact Ruan Shishi directly.

When he and several police officers drove to Renji Hospital, where Ruan Shishi was located, they were told that Ruan Shishi had not been at work for two days. Just because Ruan Shishi is the director of the Department of Obstetrics and Gynecology, and the relationship with Guo Li, the director of the hospital, is relatively ambiguous, and she usually commands in the hospital, so she didn't go to work for two consecutive days, and no one dared to ask.

According to the information provided by the hospital, Xiao Song and the criminal police went straight to Ruan Shishi's house.

It was a high-end residential community that had not yet been fully built, and I learned from the security department that I had not seen Ruan Shishi in and out in the past two days. Xiao Song and the criminal police rang the doorbell of Ruan Shishi's house, but no one opened the door, and calls to Ruan Shishi's mobile phone and home phone were also turned off and no one answered.

Xiao Song ordered the criminal police to call the property and opened the door of Ruan Shishi's house. As soon as he entered the door, Xiao Song, with his years of professional sensitivity, immediately smelled a smell of blood and a rancid smell in the air.

Xiao Song knew that something was wrong, and shouted: "Don't go in, something may happen inside, be careful not to destroy the footprints on the ground." ”

Xiao Song cautiously passed through the entrance, and just after turning into the screen, he saw a scene in the living room, which immediately stunned him.

On the floor in the living room, a female corpse lies on her back. The female corpse was wearing only a sexy set of lace underwear, and her eyes were wide open, as if she was staring at the ceiling.

The female corpse had a sharp knife stuck in her chest. On the floor, the blood that flowed out of it had long since turned black, emitting a foul smell.

The criminal police and forensic doctors who heard the news immediately launched various investigations and evidence collection work in an orderly manner under the command of Xiao Song.

The dead body was none other than Ruan Shishi, director of the Department of Obstetrics and Gynecology at Yan Chai Hospital. The time of death was two days earlier, that is, on the day Qian had just been poisoned.

The sharp knife inserted in the chest of the female corpse is a knife controlled by the Ministry of Public Security. There were no fingerprints left on the sharp knife, and there was not a single footprint left in the room, all of which showed that the murderer had sufficient time to commit the crime and had a certain anti-investigation ability.

Although no valuable clues were found at the scene, Xiao Song had already determined that Ruan Shishi's killing and Qian Gang's poisoning were very likely to have a great relationship and could be dealt with together.

Ruan Shishi's home, everything is placed in an orderly manner, and the whole house looks elegant and clean, which can be assumed that the hostess was a fashionable woman who loved cleanliness and pursued a taste of life before her death, which is the popular name on the Internet nowadays: Bai Fumei.

How did the murderer get into Nguyen Shishi's house? According to the investigation of the scene, the possibility that the murderer broke into the door or opened the window ruled out.

From this, Xiao Song judged that this was a crime committed by an acquaintance. Judging from the dress of the deceased Ruan Shishi who only wore sexy lace underwear when she died, this murderer should be someone who was extremely close to Ruan Shishi.

A scene appeared in front of Xiao Song's eyes: the murderer rang the doorbell of Ruan Shishi's house, and Ruan Shishi recognized the person from the video intercom doorbell. Because she is more familiar with the person who came, it is very likely to be a lover's relationship, so Ruan Shishi did not shy away from wearing only sexy lace underwear and opened the door.

When the two entered the living room, the killer pulled out a sharp knife and stabbed the unsuspecting Ruan Shishi in the chest.

According to Xiao Song's inference, the criminal police immediately launched an investigation into Ruan Shishi's social relations. At the same time, Xiao Song also learned about the situation at the security department and learned that Ruan Shishi was usually very arrogant and looked down on anyone at all. She has only been in this community for a few months, and she has never been seen in contact with other people in the community.

Xiao Song checked the surveillance video at the gate of the community again, but there was still no suspicious discovery. At the same time, he also knew in his heart that this surveillance video actually did not have much significance for the investigation of the case. Because the construction of this community has not yet been fully completed, not far away, due to the needs of the construction of the green garden of the community, a big hole has been opened in the wall.

If the murderer came to the community with the purpose of killing Ruan Shishi, then he would definitely avoid the surveillance at the entrance of the community and enter through the gap in the wall.

What is Ruan Shishi's background to be able to afford a duplex in this high-end residential community? How could she owe Qian Gang's millions? Why was she murdered on the same day as Qian Gang?

All this, like a fog, shrouded Xiao Song's heart.