The famous author Mark Storm's publisher is unhappy with his books and asks him to write books in a more popular genre, crime for example. When Mark Storm comes to his apartment, he finds a burglar, Kurre. He notices that they have a physical similarity and they change identity, which makes it possible for Storm to make empirical studies in the world of crime.

• Svensk Talfilm
• Edvin Adolphson
• Anne-Margrethe Björlin
• Naemi Briese
• Carl Hagman
• Carl-Gunnar Wingård
• Åke Claesson
• Marianne Löfgren
• Hilding Gavle