Fatty and Baldy, a pair of undercover detectives, infiltrate a Triad drug syndicate but are put on a leave of absence after apprehending the kingpin, Tak, in the middle of the police commander's wedding. They return to find that Tak has been bailed out and has hired a team of assassins to exact revenge.

Shy and timid Hung is asked by his jailbird brother to look after his mistress and his unsuspecting wife. Chaos and many hilarious situations arise when Hung is caught between the two women.

After receiving a life imprisonment sentence for a NY Chinatown massacre, Jia Shi Lan obtains a pardon through the Mafia's influence.