On a train headed for England a group of travelers is delayed by an avalanche. Holed up in a hotel in a fictional European country, young Iris befriends elderly Miss Froy. When the train resumes, Iris suffers a bout of unconsciousness and wakes to find the old woman has disappeared. The other passengers ominously deny Miss Froy ever existed, so Iris begins to investigate with another traveler and, as the pair sleuth, romantic sparks fly.
Elenco: Margaret Lockwood , Michael Redgrave , Dame May Whitty , Paul Lukas , Basil Radford , Naunton Wayne , Cecil Parker , Linden Travers , Mary Clare , Emile Boreo , Googie Withers , Sally Stewart , Philip Leaver , Selma Vaz Dias , Catherine Lacey , Josephine Wilson , Charles Oliver , Kathleen Tremaine , Alfred Hitchcock , Roy Russell , Ernest Blyth .