What film did Alfred Hitchcock make in Britain which proved the precursor of later films like North by Northwest?

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The 39 Steps (1935) is a British thriller film directed by Alfred Hitchcock, which follows the story of a man falsely accused of spying as he tries to clear his name and stop a group of spies from stealing military secrets. The film contains the elements of action, suspense, and mistaken identity, which are characteristic of many of Hitchcock's later films, such as North by Northwest.

What Film Did Alfred Hitchcock Make in Britain Which Proved