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Synopsis

When Hong Kong is rocked by multiple gruesome murders, the police forms a task force to investigate. Jun (Sean Lau), once a brilliant detective who suffered a mental breakdown, begins his own investigation. Eventually, the police learn that the murder victims are all suspects of cold cases being rubbed out by a figure known as "The Sleuth". Now, Jun and a detective from the task force are on a race against time to beat the brutal killer at its own game.