Cheung Ye Pang (Andy Lau) is a Cantonese detective out to combat opium sellers. Encountering high-level corruption along with close friends being murdered, Pang sets out to stop the dealers.

The plot includes the plight of two women who both find themselves betrayed by the men they love. It's a violent female 'buddy' movie, with two mismatched heroines, a policewoman and a drug addicted prostitute joining forces to seek revenge.

A young genius with an 8-year-old mentality suddenly becomes head of a Hong Kong triad.