When a young woman on a train meets a charming old lady who promptly disappears, the other passengers deny having seen her, leading the young woman to suspect conspiracy. Hitchcock's final low-budget U.K. production before leaving for Hollywood stands as an extremely deft cocktail of comedy, romance, and suspense.
A Hitchcock comedy-thriller in which two people investigate the disappearance of an old lady from a train, only to discover a plot to pretend she was never on the train in the first place.