You’d think being an informant for the police would be a fantastic career choice. Constantly playing both sides of the law, living the glamorous snitchy lifestyle in seedy locales, always wondering if your criminal friends are going to discover what you’re up to and silence your squealing ways… but you’d be wrong. And clearly not someone who’s ever watched a movie involving a police informant. (Starsky & Hutch‘s Huggy Bear notwithstanding.) Detective Don Lee (Nick Cheung) is working a case with the help of an informant whose safety he’s guaranteed, but when the sting goes bad the snitch is attacked and left clinging to life. Time moves on and new cases roll in, and soon Lee is looking for a new inside man. He finds that man in Ghost (Nicholas Tse), a recently paroled street racer desperate to free his sister from her life of forced prostitution. Ghost has no interest in the job, but the promise of cash means little sis can stop working on her back. Lee helps Ghost work his way into a gang of brutal jewel thieves, and perhaps not so surprisingly, things don’t go as planned.