Set in Casablanca shortly after World War II, escaped Nazi war criminal Heinrich Stubel (Sig Ruman) has steadily murdered three different managers of the Hotel Casablanca. Disguised as a Count Pfferman, Stubel's goal is to reclaim the stolen art treasures that he has hidden in the hotel. However, the only way he can do this undetected is by murdering the hotel's managers and running the hotel himself.