For the first of the famous Gainsborough melodramas, the studio fielded all of their star actors. Phyllis Calvert bagged the central character, but the box office name was Margaret Lockwood and after this she became known for her bad girl roles. It made James Mason a major star and was a big break for Stewart Granger.
The most startling aspect of the film is how luxuriously Regency England is staged, with lavish sets, coiffure and costumes. This was produced in the austerity of the war years, so credit to the crew for making this look so good. The other significant factor is how sexy it is, with the bodices for the females, and tight britches for the men.
Mason plays a ruthless, decadent aristocrat who marries the demure Miss Calvert to provide him with a son without her getting in the way of his degenerate leisure pursuits. She invites a former schoolfriend (Lockwood) who has fallen on hard times, to live with her. The envious guest starts an affair with the husband and plots to do away with the wife...
It's the sort of gothic melodrama that features a gypsy curse, a duel, and a climactic electrical storm. It was a huge hit on the home front. It's got it all. Including a racist expletive, which may be realistic for London in the early 1800s, but unforgivable for a film in 1943. Still, the handsome production was a signifier that Britain was beginning to emerge from the shock of war.