Fifty-year-old Erland lives in an industrial town, works in the local paper mill, and manages a seminar about marriage problems with his wife at the Pentecostal church. Everything is fine, until his best friend Sven-Erik introduces him to his wife Karin at a party. The desire between Erland and Karin is combustible, and the situation soon becomes unbearable. Erland then offers a modern solution: to live in the same house and create a temporary commune with rules of behavior and shifts for chores, waiting for this out-of-marriage passion to come to an end.