During World War II, many movie stars played a real-life role in espionage. One of the most successful was Norwegian actress and singer Sonja Wigert. The Germans wanted to use film in their propaganda war and Sonja, who was living in neutral Stockholm at the start of WWII, was at the top of the list for Reichskommissar Terboven and the German film companies. When her father was imprisoned by the Germans, Sonja (Ingrid Bolsø Berdal) enlisted as a spy for Swedish intelligence before going to Terboven in Oslo to flirt her father out of prison. She succeeded, but Terboven, the de facto Nazi viceroy of Norway, wanted Sonja as his private spy and mistress. As she infiltrated deeper into the German spy network, threats and rumors about her sympathies began to wear on her, and she faced a fateful decision to save her relationship with the Hungarian diplomat Andor Gellert.