Writer/director Robert Siodmak based his German-filmed The Devil Strikes at Night on an actual case. Set during the last months of the Hitler regime, the film concerns a series of rapes and stranglings of young women. Gestapo officer Rossdorf (Hannes Messemer) and non-party member Axel Kersten (Claus Holm) investigate the trail of evidence. They discover that the criminal is Bruno Leudke, a mental defective (played by Mario Adorf). An open-and-shut case...except for the fact that Adorf is a loyal Nazi Party member! The dilemma now is to stem the crime spree without publicizing the embarrassing fact that "Aryan supremacy" is capable of yielding a monster like Adorf. Originally titled Nachts, Wenn der Teufel Kam, The Devil Strikes at Night has also been released as Nazi Terror at Night and Nights When the Devil Came.
by Hal Erickson synopsis