Chief B (Danny Lee) is an unconventional CID member who relies more on instincts rather than by the book to resolve situations. He's a down-to-earth fellow who's a mamma's boy, not too well-educated, and an outstanding member of the CID. Police Officer Kit (Eddie Chan) has just been promoted from the rank-and-file to CID, and at the same time is studying for the test to become an Inspector. Chief B takes him under his wings to investigate numerous gang-related cases. Kit, previously a by-the-book type of police officer, learns a lot from Chief B.

Kin Seng (Leung Ka Fai) falls into big debts in the gambling house. He persuades his loving wife, May (Lin Ching Hsia), to embezzle a huge sum from working place to save him. They go to Thailand to seek help from Kin Seng's uncle but in vain. On their return Journey, May accidentally falls off the ferry and Kin Seng commits a deliberate murder. [...] What is going to happen next? -From the Fortune Star Legendary Collection DVD summary.