Ten years ago, a mysterious serial killer named "City Scavenger" appeared in Jiangcheng, specializing in killing evildoers beyond the control of the law.
The master died tragically, the Iris Mark became an unsolved case, and trace detective Shen Ci was forced to retire.
Ten years later, the murder reappeared!
In the old residential building, the deceased had no struggle, no injuries, and no traces of the murderer. The blue iris on the wall announced the return of the devil.
The retired detective is forced to return to the world!
A speck of dust, a fiber, a drop of blood can become his key to solving the case.
The perfect crime? Crime without a trace? Chain layout?
In the face of absolute micro-trace exploration, nothing can be hidden!
A series of hard-core murder cases, layers of human abyss.
This time, he will use the traces as a blade and the truth as a lamp to personally uncover the real murderer who has been hiding for ten years!
