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.

Lawyers Olle Boman and Ragnar Berglund takes a trip to the small town of Uppköping.