After being raped in a hotel room where she was staying during a scientific conference, psychiatrist Emma Stein no longer leaves her house. She is the only one of several victims of a psycho-maniac who survived, and she’s afraid the criminal will strike again to finish his terrible work. Driven into paranoia, Emma feels safe only in her small mansion on the outskirts of Berlin—until one day the mailman asks her to accept a package for the neighbor. The man whose name she doesn’t know and whom she has never seen has lived on this street for years…