First film version of JB Priestley's classic socialist play about the thoughtlessly cruel exploitation and degradation of a working class girl. In his greatest performance, Alastair Sim plays a police inspector who visits the home of a factory owner, not so much to investigate, but to identify the guilt of each member of family in the suicide of a young woman who crossed all their lives. Rather thrillingly, she may have been a composite person comprising many of her class, making her a symbolic victim. The film version develops the supernatural element of the play, making it very spooky indeed. The newly scripted flashbacks work very well, but otherwise the film takes place in a single room, with a great deal of talk, which doesn't prove to be problematic. A fine achievement for Hamilton, best known for his Bond films. Brilliant, heartstopping ending too.