Lo Ka Yiu, a young ad designer who is sentenced to jail for manslaughter, has gotten himself in trouble with the corrupted wardens and fellow inmates of Triad background. Chung Tin Ching, a veteran inmate and Yiu’s mentor, is forced to confront his comrade’s enemies time and again, leading up to the final showdown with the head of security.
While conducting a raid of an illegal arms deal, detective Mew Mew discovers the body of a dead woman and her daughter who witnessed the murder. Believing that the girl may be in danger, Mew Mew seeks out her aunt Cher, and the three develop a bond, but Cher’s ex-husband and a vengeful gunrunner soon show up to disrupt their short-lived peace.
A reforming ex-gangster tries to reconcile with his estranged policeman brother, but the ties to his former gang are difficult to break.