Sonja Wigert, Scandinavia's most acclaimed female movie star, lives in neutral Stockholm when World War II breaks out. The Germans want to use film in their propaganda war, and Sonja is at the top of Reichskommissar Terboven and the German film companies' list. When her father is imprisoned by the Germans, Sonja enlists as a spy for Swedish intelligence before going to Terboven in Oslo to flirt her father out of prison. She succeeds, but Terboven now wants Sonja as his private spy and mistress.