The 39 Steps (All Region DVD) 1935 Robert Donat, Madeleine Carroll, Lucie Mannheim

A man in London tries to help a counterespionage agent. But when the agent is killed and the man stands accused, he must go on the run to both save himself and also stop a spy ring.
Director: Alfred Hitchcock
WRITERS IMPRESSED: John Buchan (upon whose 1915 novel the film was based) was impressed with the film, despite departures from his original plot.