Two photographers from Stockholm go to the west coast on behalf of their employer, who is a swimwear manufacturer. They will look for the season's most beautiful bathing girl, but it will be harder than they think to find the ideal model.

To save intoxicated friend Boman from getting caught, two conscripts lock him up in the local jail and release a prisoner, Ivan Jansson, so that he can pretend to be Boman for a few hours. But when the real Boman is transported to the county jail, switching them back could be difficult.

The young girl Lisbet lives on the farm Tolfmansgården together with her mother, her older brother Jerker and their grandparents.