Welcome to Monster Madness 2019!! Kieran and James review M, the Fritz Lang Classic. M is a 1931 German drama-thriller film directed by Fritz Lang and starring Peter Lorre. The film was written by Lang and his wife Thea von Harbou and was the director's first sound film. In this classic thriller, Hans Beckert (Peter Lorre), a serial killer who preys on children, becomes the focus of a massive Berlin police manhunt. Beckert's heinous crimes are so repellent and disruptive to city life that he is even targeted by others in the seedy underworld network.