The Testament of Dr. Mabuse, also called The Last Will of Dr. Mabuse, is a 1933 German crime-thriller film directed by Fritz Lang. The movie is a sequel to Lang's silent film Dr. Mabuse the Gambler (1922) and features many cast and crew members from Lang's previous films. Dr. Mabuse is in an insane asylum where he is found frantically writing his crime plans. When Mabuse's criminal plans begin to be implemented, Inspector Lohmann tries to find the solution with clues from gangster Thomas Kent, the institutionalized Hofmeister and Professor Baum who becomes obsessed with Dr. Mabuse.