Inspector E.T. (Alex Man) investigates a murder case reported by singer Chu Szu Ting (Shirley Lui). The suspect, plastic factory owner Lu (Michael Tong) testifies and is acquitted. An important clue is later found and killer Lu comes to attack Szu Ting only to be stopped and killed by E.T. and his men. E.T., who has been estranged from his wife, tries different tricks to woo Szu Ting and eventually wins her heart. Her long lost father Chu Hung (Ku Feng), newly discharged from prison, intends to retrieve a hidden loot and tells her of his intention to join her. Szu Ting tells E.T. to probe his background when E.T. is injured and hospitalized. She takes her father to their former residence as ordered, but something there makes her suspicious of his identity. She spots him holding an axe and shouts for help when he is killed by someone sent by E.T. to secretly protect her.