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They Knew Mr. Knight is a 1946 British drama film directed by Norman Walker and starring Mervyn Johns, Nora Swinburne and Joyce Howard. It was based on a 1934 novel of the same title by Dorothy Whipple. A man is sentenced to twelve months in Lincoln jail following his involvement in a share scam, plunging himself and his family into despair. However, by the time of his release he is able to face his uncertain future with fortitude.