Alfred Hitchcock Director Margaret Lockwood Iris Matilda Henderson Actor Michael Redgrave Gilbert Redman Actor Dame May Whitty Miss Froy, Governess Actor Paul Lukas Dr. Hartz of Prague Actor Googie Withers Blanche Actor Cecil Parker Eric Todhunter Actor Linden Travers "Mrs." Margaret Todhunter Actor Catherine Lacy The Nun Actor Naunton Wayne Caldicott Actor Basil Radford Charters Actor Mary Clare Baroness Actor Emile Boreo Hotel Manager Actor Sally Stewart Julie Actor Philip Leaver Signor Doppo Actor Selma Vaz Dias Signora Doppo Actor Ethel Lina White Writer Sidney Gilliat Screenwriter Frank Launder Screenwriter Edward Black Producer Louis Levy Original Music, Musical Director Cecil Milner Original Music Jack E. Cox Cinematographer R. E. Dearing Film Editing Alex Vetchinsky Art Department Sydney Wiles Sound Recordist Albert J. Whitlock Scenic Artist