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Secret Agent is a British film directed by Alfred Hitchcock, loosely based on two stories in Ashenden: Or the British Agent by W. Somerset Maugham. The film starred Madeleine Carroll, Peter Lorre, John Gielgud, and Robert Young. Future star Michael Redgrave made a brief, uncredited appearance; he would play the male lead in Hitchcock’s The Lady Vanishes (1938). The work was also Michael Rennie‘s film debut (though an uncredited one).
Typical Hitchcockian themes used in Secret Agent include mistaken identity and murder. [Wikipedia]
After three British agents are assigned to assassinate a mysterious German spy during World War I, two of them become ambivalent when their duty to the mission conflicts with their consciences. [IMDB]