A serial killer "Clockmaker" appears in Binhai City, specializing in killing morally corrupt people who escape legal punishment. An antique clock pointing to the time of death must be left at the scene.
Lu Chen, the traumatized criminal investigation captain, Su Qingyuan, the criminal profiler who solved the case for his sister, and Zhao Lei, a technical backbone, formed a team to pursue the murderer. During the collision of reasoning, they discovered that behind the series of cases lay old grudges and power-money transactions related to the case of a girl falling from a building five years ago.
Faced with the targeted revenge of the murderer and the double obstruction of the behind-the-scenes promoters and the police insiders, the three broke through the technical blockade and personal threats, explored the boundaries of justice, and vowed to uncover the truth behind the "clockmaker" being led to commit crimes, so that the injustice could be vindicated and the crime brought to justice. Time is ticking, and judgment and redemption are instantaneous.
