" Apart from "Es geschah am hellichten Tag" (recently remade by Sean Penn) I'm thinking of the following works:* M - Eine Stadt sucht einen Mörder (1931)* Nachts, wenn der Teufel kam (1957)* Die Zärtlichkeit der Wölfe (1973)* Der Totmacher (1995)While three of these films are more or less loosely based on the case of Fritz Haarmann who killed more than 24 young men in the 20s, "Nachts, wenn der Teufel kam" is about Bruno Luebke who murdered several people in Hamburg during WWII (also a true case)"
