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I Was a Spy is a 1933 British thriller film directed by Victor Saville and produced by Michael Balcon. It stars Madeleine Carroll as Marthe Cnockaert, Herbert Marshall, and Conrad Veidt. Based on the 1932 memoir I Was a Spy by Marthe Cnockaert, the film is about her experiences as a Belgian woman who nursed German soldiers during World War I while passing intelligence to the British. The film was produced by Gaumont British Picture Corporation with Woolf & Freedman Film Service and Fox Film Corporation distributing in the United Kingdom and the United States respectively.