The Man in Grey (1943)

Synopsis
A set of flashbacks to 19th century London provide the action in this British wartime film, in which a wealthy girl (Phyllis Calvert) becomes friends with a young waif (Margaret Lockwood) while at school. The waif later becomes a governess for the girl, but betrays their relationship by having an affair with her friend's husband (James Mason). The Man in Grey did exceptionally well in England at the time of its release, and later spawned a cavalcade of similar movies. ~ John Bush, All Movie Guide