When Hong Kong is rocked by multiple gruesome murders, the police forms a task force to investigate. Jun, 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.
Elenco: Lau Ching-wan , Charlene Choi , Raymond Lam , Tan Kai , Carman Lee , Carlos Chan , Kathy Yuen , Jeana Ho Pui-Yu , Edward Ma , Tony Wu , Kevin Chu , Ma Ruihan , Li Jing , Bin Chen , Stephanie Che , Timmy Hung , Deep Ng , Angus Yeung .