Paul is very good at setting up extremely unsuccessful businesses. He lives in a garage between a trading company and a furniture store. Ever since his wife left him, he hasn't seen much of his son Niki. When Niki spends a weekend with him, the two go and drive a few laps in a racing go-cart. They soon acquire a taste for it. Together with the grumpy old shopkeeper Karl, whom they abuse as sponsor for their adventures, they prepare to spend the whole summer holiday going from race to race. It soon becomes clear that they don't have a hope in hell in the races, but Paul is much too headstrong to give up at once.