"M - A City Hunts a Murderer" is a 1931 German thriller film directed by Fritz Lang. The film follows the story of a serial killer who preys on children in a German city. The killer sends taunting letters to the police, signing them with the letter "M". As panic spreads throughout the city, the police launch a massive manhunt to capture the elusive murderer.
As the investigation intensifies, the criminal underworld also becomes involved in the search for the killer. The criminals, fed up with the negative attention brought by the murders, decide to take matters into their own hands and track down the killer themselves.
The film is known for its innovative use of sound and visuals, as well as its exploration of themes such as justice, morality, and the nature of evil. "M - A City Hunts a Murderer" is considered a classic of German cinema and a landmark in the thriller genre.