Tony Leung, taïwanese cop, decides to go undercover inside a prison in order to investigate the death of his mentor. In the same time, Jackie Chan, brilliant pool player, winds up in jail after a tortuous and dramatic serie of events that unwillingly led him to murder. Andy Lau Tak-Wah, mobster and big brother of the one Jackie accidentally killed, settle things to be put in jail in order to execute his retaliation himself. All those guys end up in the same dark prison where you also find Samo Hung Kam-Bo, as an old timer of this place and Jimmy Wang Yu as the dark boss of the prison, the kind to slick his hairs with an egg and to slash his arm in order to calm down those dying for revenge...
