Whilst Clive Reader celebrates his taking silk but Martha hits the bottle, angry that inspector Wright has lied in court to convict her client Johnny Foster. Later David, the teen-aged son of chambers head Alan Cowdrey, is arrested for causing the death of a policeman , one of six who kettled him during a demonstration. Martha believes David has been bullied into pleading guilt...
受过特警训练的警察陈家驹（成龙）为人正直办案拼命，时常将女友（张曼玉）忽略。某次围剿行动中陈家驹拘捕了大毒枭朱滔，但因证人（朱滔的秘书）莎莲娜（林青霞）的突然失踪，未能将其绳之于法，陈家驹因此受降职处分。事后含恨在心的朱滔为了报复陈家驹，设计将其诱至囚禁莎莲娜的别墅，并派手下杀死一名警察嫁祸其身，令陈家驹在警方的通辑令下只能四处流亡。 而侥幸逃脱的莎莲娜明白到朱滔为人不择手段的本质，为求自保，冒险潜入朱滔办公室偷得证据，却被其手下追杀至商场，陈家驹及时赶到，与朱滔手下展开激战。
