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 Nazi Commanders Josef Terboven’s list. When her father is imprisoned by the Germans, Sonja enlists as a spy for Swedish intelligence before going to Oslo to secure her father’s release from prison. She succeeds, but Terboven now wants her as his private spy and mistress.