Peggy Evans

1953. A police detective suspects that his sister's boyfriend is a murderer.

An immensely popular British crime film, Basil Dearden's The Blue Lamp was scripted by ex-policeman T. E. B. Clarke, the writer who arguably did most to define Ealing Studio's post-war identity. The film marked the first appearance of the character of Jack Warner - later to be immortalised in Dixon of Dock Green.