The children in the quaint little town of Timpeltill are constantly up to mischief, and the problem appears to be getting worse, in this fable based on a much-loved children's novel. When a pint-sized prankster ties an alarm clock to a cat's tail, causing mayhem throughout the town, the grown-ups decide to teach their badly-behanved offspring a lesson. One morning the children wake to find there isn't a single adult in Timpeltill and it's down to them to fend for themselves. The kids quickly form two clans, one led by Oscar, the thuggish son of the town's butcher and the other by the bossy but well-intentioned Marianne, who tries to reassure the younger children while bringing a semblance of order to the town. It's soon open warfare between the two gangs, the ever-resourceful children transforming tennis rackets, potatoes and other every-day items into weapons of destruction. But just where are their parents?