While London Sleeps is a 1926 Warner Bros. film about a police-dog, Rinty, who helps Scotland Yard defeat a dangerous criminal organisation known as the Mediterranean Brotherhood that operates out of the Limehouse district of London. Walter Morosco wrote the screenplay. It was the first of many films directed by Howard Bretherton, and one of several created for Rin Tin Tin, a German Shepherd dog used in films during the 1920s and 1930s. The film was also released with a Vitaphone sound-on-disc soundtrack with a music score and sound effects, and only the sound discs survive today. The British release prints censored the more horrific aspects of the film.George Kotsonaros only appeared in two horror films, this one and The Wizard (1927), and he played a beast-man in both movies. He died in a car accident in Alabama in 1933.