In this psychological thriller produced by Derek Yee (The Great Magician, One Night in Mongkok), a psychiatrist Chow Ming-kit (Huang Xiaoming) is lured to the dark side of the mind by his patient and convicted murderer Fan Kwok-sang (Lau Ching-wan). Three years before the film starts, Fan was committed to a psychiatric hospital after his paranoia and violent temper led to the accidental death of his wife Wai-ling (Michelle Ye). Now he's up for release and Chow vouches for him against the objections of his seniors and quickly finds his career on an upward swing. Fan isn't doing as well, and after a terrible incident Chow finds himself desperate to defend Fan and his career. Lau Ching-wan is wonderful here as he ravishes this role and goes from anger to contrition to plotting in rapid fire sequences causing a sort of audience whiplash in the process.