In the waning days of the Ming dynasty, Japanese marauders raid villages on the Chinese coast. A wandering swordsman single-handedly dispatches a group of the foreign thugs, and agrees to help defend the town. He assembles a core team of highly skilled warriors, and together they train the townsfolk to stand up to the foreign pirates, using strategy and skill. When the army launches an all-out assault on the town, a ferocious battle rages, leading to final conflict on the Beach of the War Gods.

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.