Sergeant Tong is wracked with guilt after he unwittingly kills a young girl whilst capuring a criminal named Cheung. When the girl's sister is later kidnapped in a ploy to get Cheung released, Sergeant Tong vows to find and rescue her before she comes to harm.
Policeman Don often works with informants but numerous too-close calls and failed missions cause him to see the world as one betrayal after another. Then, he meets Ghost, Jr, and is given a new chance to change his views.
