Britain's first part-talkie, directed by Alfred Hitchcock (who makes his usual small appearance, this time on a tube train), is still amazingly hypnotic to watch today, with several sequences that remain genuinely striking. The atmosphere reeks with the feeling that something nasty is going to happen any second, a sign that Hitchcock's expertise at tightening tension was already building up. Future directors Ronald Neame and Michael Powell were clapper boy and stills cameraman respectively on this landmark thriller.

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