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The Mark of Cain is a 1947 British drama film directed by Brian Desmond Hurst and starring Eric Portman, Sally Gray, Patrick Holt and Dermot Walsh. The film is based on the 1943 novel Airing in a Closed Carriage by Marjorie Bowen, which in turn was based on the true life murder trial of Florence Maybrick. It was made at Denham Studios with sets designed by the art director Alex Vetchinsky. imdb.com