Chu Yen-ping directs this all-star cast prison flick about cop Huang Wei (Tony Leung Kar-fai) who goes into the clink undercover to figure out how the fingerprints of a long deceased death-row inmate ended up at the scene of a recent murder. There he quickly runs afoul of gangland powers, making his life a living hell. His fellow inmates include Lung (Jackie Chan) who killed a card sharp to pay for an operation for his girlfriend; Triad (Andy Lau Tak-wah) who looking for the guy who killed his brother in jail; and Lui (Sammo Hung Kam-po) a sadsack con who regularly breaks out to visit his son. Later, Huang kills a prison guard and is sentenced to death. He soon learns that the jail's crazed warden is using supposedly executed criminals to kill crime bosses who are beyond the law.
by Jonathan Crow synopsis