Three bizarre murders occurred in Bencheng City in a row. Next to each victim's body was a stopped old-fashioned mechanical clock, with the hands always fixed at different "moments of death." Lu Chen, the deputy captain of the criminal investigation detachment, was assigned to take over the case at a critical moment because of an "unjust case" that led to the suspect's suicide five years ago. His partner is Lin Xi, a newcomer who has just graduated from the police academy and is proficient in forensics and digital tracking. During the running-in, the two discovered that the victims seemed to have no connection, but they all had a secret connection with the unjust case five years ago.
As the investigation deepened, the murderer, who regarded himself as a "watchmaker", continued to use precise time and ritualized crime techniques to provoke the police, and even took the initiative to send anonymous letters with clues to Lu Chen. While Lu Chen wants to solve the death mystery set by the "Clockmaker", he also has to fight against the guilt and self-doubt deep in his heart - he gradually realizes that the target of the "Clockmaker" may not be the victim, but himself. When the gears of truth gradually bite, the shady story of the unjust case five years ago, the undercurrent within the police, and the true identity of the "clockmaker" are revealed layer by layer. Lu Chen must save the next victim while completing his own redemption and stopping this revenge carnival in the name of "time."
