Kit is a Hong Kong undercover cop who becomes a drug addict to infiltrate a crime syndicate which has been kidnapping people and sending them to Thailand, where the victims are killed and have their organs sold in the black market. The mastermind behind the syndicate, Mr Hung, has a rare heart condition and needs to undergo a heart transplant to prolong his life. Hung's younger brother is the ideal donor for a heart. When Hung sends his men to kidnap his brother, the situation goes haywire and a gunfight breaks out because the police has been tipped off by Kit about the kidnappers' plan. Hung's brother is injured during the shootout but is rescued by the police. Kit, on the other hand, escapes with the kidnappers but his cover is blown. Hung's men knock him unconscious and send him to a prison in Thailand. The chief warden, Ko Chun, works for Hung and has been keeping the kidnapped victims alive in the prison before they are killed for their organs. Kit is made to serve a life sentence in the prison. Starring: Tony Jaa, Wu Jing, Simon Yam, Zhang Jin, Louis Koo, Ken Lo, Jun Kung, Dominic Lam. 121 minutes. Mandarin. English dubbed. English subtitled.