The Door with Seven Locks (1940 film)

The Door with Seven Locks is a 1940 blackandwhite British film, created and released shortly after the British Board of Film Censors lifted its mid1930s ban on supernaturalthemed and horror genre films. It was based on the novel The Door with Seven Locks by Edgar Wallace. Released in the United States by Monogram Pictures under the title Chamber of Horrors, it was the second Wallace film adaptation to arrive in the United States, the first being The Dark Eyes of London called The Human Monster in the US, starring Bla Lugosi, which had been released the year before.

Source: Wikipedia