Fritz Lang's first sound film, his most chilling and provocative work, features Peter Lorre's greatest performance as a child molester and murderer. As the film opens, Berlin is gripped by terror: a child molester is killing little girls, while the police's frantic search has so far turned
up no clues to his identity. Frenzied citizens inform on their neighbors; police raids net scores of criminals, but none that can be linked to the killings. To stop this trend, the underworld's leading members resolve to catch the killer themselves, ordering the criminal community to find the
murderer and bring him to a tribunal--and the trap to catch the desperate man is set in ...