Bumbling private detective Chan Tam is enlisted by police pal Fung Chak to help in the investigation of a serial murder case. The victims a middle-aged man killed at home, a dead woman found in the trash dump, and a teenage girl slain in the park were all killed in grisly manners, but they didn't seem related to one another. With no clue to follow up on, Tam is decidedly at his wits' end.

The story of a farmer forced into conscription, who has been looking to get out of the army ever since. His great chance arrives when he stumbles upon a wounded general from an enemy state, and he kidnaps him, intending to claim credit for the capture, which includes five acres of land, and most importantly, honorable discharge from the army.