Hitchcock's: The Lady Vanishes

Soon-to-be-wed English woman Iris Henderson is alarmed by the disappearance of an elderly governess Miss Froy during a train ride in 1930's central Europe. Other passengers deny seeing the woman. Iris has only one ally- a music scholar named Gilber Redman. The duo search for clues for Miss Froy's disappearance, unlocking a sinister international plot.