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D.O.A. (1950) is a film noir drama film directed by Rudolph Maté, considered a classic of the stylistic genre. The frantically-paced plot revolves around a doomed man's quest to find out who has poisoned him – and why – before he dies. The film begins with a scene called "perhaps one of cinema's most innovative opening sequences" by a BBC reviewer. The scene is a long, behind-the-back tracking sequence featuring Frank Bigelow (O'Brien) walking through a hallway into a police station to report a murder: his own. Disconcertingly, the police almost seem to have been expecting him and already know who he is.