If you were offered a million dollars to kill someone, would you be willing?

As soon as the girl came home from jumping, she opened the bedroom door and saw a large area of blood, and her father had a knife stuck in his back. The girl was frightened, she screamed and ran to her mother, who was sitting on the couch, only to find out that her mother's head had been cut off, causing the girl to scream loudly. Police officer Lao Ji came to the scene, and the forensic doctor judged that the time of death of the whole family was around 11 p.m. based on the dryness of the deceased's bloodstains. The murder weapon was a single-edged knife, and the deceased showed no signs of struggle and may have been asleep at the time of the killing. The deceased's clothing had orange and purple fibers, which are commonly found on airline seats, and the killer was likely to have flown in to commit the crime.

Cuong found a broken piece of paper with a pattern at the scene, and after checking the pattern, the pattern was the logo of a rental company located in N City, and it is now certain that the murderer took the plane knife from N City. Through the known clues, Lao Ji was screened layer by layer to lock up a suspect - Hu Qi Lao Ji decided to go to N City to meet this Hu Qi, but before Lao Ji arrived in N City, Hu Qi was already dead. It turned out that Hu Qi's real identity was an undercover policeman, and he had already died in a gambling den. Police officer Ah Qiang found that Hu Qi's driver's license was missing, and Lao Ji happened to arrive at the scene at this time, Lao Ji speculated that the murderer killed Hu Qi, and then took Hu Qi's driver's license, and impersonated Hu Qi's identity to board the plane and came to M City to kill the couple. Now the two officers are tracking down the same person, and they have decided to work together to solve the case. Ah Qiang found the fingerprints of the murderer on Hu Qi's wallet, and determined that the murderer's identity was Song Jie through comparison.

Ji and Cuong arrive at Song Jie's rental house, they break down the door, but Song Jie escapes through the window. Lao Ji and Ah Qiang had to look for clues in Song Jie's rental house, and Lao Ji found a note that said "No. 158 Xinbaodao". He guessed that Song Jie mistook the previous deceased couple for his target and killed the wrong person, if this was the case, would Song Jie's real target be killed.

Lao Ji and Ah Qiang immediately rushed back to M City, and sure enough, Xie Qiang and his wife at No. 158 were also killed. Xie Qiang's wife still had a murder weapon on her body, but Xie Qiang's son was seriously injured but still alive, and the two police officers immediately rushed him to the hospital. Cuong discovers that there is a black hair in Xie Qiang's room, while Xie Qiang's wife has yellow hair. It shows that Xie Qiang has secretly met other women here, and the secretions under the table also confirm this. The police found blood stains on the back door of Xie Qiang's house, which requires a key to open, in addition to Xie Qiang's family, which has three doormen, and also has one, and the inspection found acrylic chips in the back door lock, which is a common material used to copy keys.

It is very likely that Song Jie copied a key and then sneaked into the house through the back door, but the copy key must have a master key, so it seems that the doorman is most likely Song Jie's accomplice. But the inspection found that only Xie Qiang's wife's key had traces of copying among the four master keys, what happened? Ah Qiang's inspection found that Xie Qiang's crotch had a blue cosmetic ingredient, which was basically only used by women in bars. So Cuong found the only person in the bar who used blue makeup - Yanran. Yanran said that she didn't kill Xie Qiang, she went to play with Xie Qiang that night, and it was three o'clock in the evening when she left. Since Cuong wasn't sure if Yan Ran was lying, he had to take back the pants Yan Ran was wearing that day to test them.

There is indeed male secretion on Yanran's pants, but it is not Xie Qiang's but Xie Qiang's son's, Xie Qiang's son is "Yanran is actually his girlfriend", because his father often lied to Yanran and coaxed her, and when Yanran secretly cried, Xie Qiang's son went to comfort her. Over time, the two of them have a relationship, but they will never do such a ridiculous thing as killing their father.

Lao Ji compared the wounds of Xie Qiang and his wife and Xie Qiang's son, and he found that the wounds of Xie Qiang and his wife had bruises in the shape of knife handles, but the wounds of Xie Qiang's son were not. This shows that there were two murder weapons that night, one with a knife handle and the other without a knife handle. Cuong thinks that the other murder weapon should still be at the crime scene, and he sees the security guard throwing garbage into the elevator, and Cuong suddenly realizes that the murder weapon may have been thrown into the elevator shaft. So everyone went down to search, and sure enough, he found another murder weapon in the elevator shaft. He also found an ornament on a janitor's uniform. The doorman was brought in for interrogation, and the sleeve of his uniform was missing an ornament that had been cut off when he was cleaning up the bloodstains, and Cuong reasoned about the doorman's motive and process through Xie Qiang's will.

Xie Qiang had a heart attack one day, the doorman rescued Xie Qiang at that time, Xie Qiang promised to give the doorman a million dollars after his death because of the doorman's kindness, but the doorman couldn't hold his breath, in order to get a million dollars in advance, he stole the key of Xie Qiang's wife, and hired Song Jie to kill Xie Qiang's family. Leaving Xie Qiang's son alive was to give the police a smoke bomb, hoping to transfer the suspicion to Xie Qiang's son, and finally the police arrested Song Jie in another rental house, and the doorman confessed to all the crimes.

As the saying goes: customers don't leave the goods, wealth is not exposed, Xie Qiang may die and didn't expect a kind reward to cost his life...

End of this chapter