The Man Upstairs on AllMovie

The mental breakdown of a guilt-ridden man provides the drama in this fascinating psychological profile that stars Richard Attenborough as a scientist who can't live with himself after he accidentally kills the brother of his fiancee. In order to escape the pain, Attenborough changes his name and begins living in a ramshackle Victorian boarding house where he slowly begins losing his mind. Eventually the police show up and begin taking statements from the bewildered, frightened tenants.