Released after three years in prison, Max finds out her father, a wealthy businessman, has hired a stranger to play his son. Meanwhile, the ex-husband of the Rent-a-Family director plans to rob Max' father.

Jacob and Finn establish their own private detective agency at a car-wrecking dump, then set out to ensnare clients. Once they have one, they proceed to make a hopeless mess out of everything for everybody. They remain, of course, blissfully unaware of their own ineptitude.

Throughout the 1970s, Sejr Volmer Sørensen enjoyed great success with the revues he staged every summer in Nykøbing Falster until 1978. It was in these performances that comedian Kai Løvring truly rose to fame. An edited version of the 1973 summer revue.