22. Sabotage (1937)
Stars: Sylvia Sidney, Oskar Homolka, John Loder
Made during his pre-Hollywood tenure in Britain, Hitchcock's daring, controversial 1937 thriller Sabotage follows a Scotland Yard detective (Oskar Homolka) who's tirelessly tracking down a terrorist with intentions to bomb London. Screenwriter Charles Bennett's nicely paced cat-and-mouse plot packs a few unexpected and brave explosions of its own, namely a suffocatingly tense sequence in which a little boy unknowingly carries a time bomb onto a crowded bus, a horrifying set-up that Hitchcock sees all the way through to its shocking end.