||Margaret Lockwood (Iris Matilda Henderson), Michael Redgrave (Gilbert Redman), Dame May Whitty (Miss Froy), Paul Lukas (Dr. Hartz), Basil Radford (Charters), Naunton Wayne (Caldicott), Cecil Parker (Eric Todhunter), Linden Travers ('Mrs.' Margaret Todhunter), Mary Clare (Baroness Isabel Nisatona), Emile Boreo (Boris the Hotel Manager), Googie Withers (Blanche), Sally Stewart (Julie), Philip Leaver (Signor Doppo), Selma Vaz Dias (Signora Doppo (as Zelma Vas Dias)), Catherine Lacey (The Nun (as Catherine Lacy)), Josephine Wilson (Madame Kummer), Charles Oliver (The Officer), Kathleen Tremaine (Anna), Alfred Hitchcock (Man in London Railway Station (uncredited)), Roy Russell (Violinist (uncredited)), Ernest Blyth (Foreign Office Man (uncredited))
||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.