Synopsis

The Testament of Dr. Mabuse is Fritz Lang's sequel to his flamboyant Dr. Mabuse two-part epic of the 1920s, this time adding subtle use of sound to the creepy effects developed for the earlier film. Once a Moriarty-like mastermind, the haggard Dr M (Rudolf Klein-Rogge) has become an autistic asylum inmate who scrawls plans for daring crimes in his cell and exerts an unhealthy influence on his psychiatrist. Inspector Lohmann (Otto Wernicke), the jolly policeman from Lang's M, is puzzled by a series of daring crimes that bear the Mabuse signature, and a gang of thugs take instructions from a shadowy figure who claims after the doctor's death to be Mabuse reborn and is staging a reign of crime apparently designed to bring about the ruin of all law-abiding society.