Slipper (Chan) was raised by poor parents and expelled from school at an early age, became notorious for his lightning-fast footwork and quick-fingered hijinks. Now Slipper has managed to tally up a massive amount of gambling debt. With no other choice, he accepts his crooked landlord's bid to participate in a series of crazy heists. Paired up with Octopus they successfully kidnap a tycoon's grandson, but unforeseen complications lead the trio to keep the baby longer than they originally intended.
When the men learn that a triad intend to collect on some unpaid ransom and kill the child in the process, they decide to keep the baby indefinitely as an unofficial 'adopted son' and train him in the ways of burglary. But as the rollers and the triads begin to close in, the men must figure out a way to return the baby to his parents