Curtis Harrington Director Shelley Winters Mrs. Forrest Actor Mark Lester Christopher Coombs Actor Chloe Franks Katy Coombs Actor Ralph Richardson Mr. Benton Actor Lionel Jeffries Inspector Ralph Willoughby Actor Hugh Griffith Mr. Harrison Actor Rosalie Crutchley Miss Henley Actor Pat Heywood Dr. Mason Actor Judy Cornwell Clarine Actor Michael Gothard Albie Actor Marianne Stone Miss Wilcox Actor Jacqueline Cowper Angela Barnes Actor Richard Beaumont Peter Brookshire Actor Charlotte Sayce Katharine Forrest Actor Robert Blees Screenwriter Jimmy Sangster Screenwriter, Producer Samuel Z. Arkoff Producer James H. Nicholson Producer Louis M. Heyward Executive Producer Kenneth V. Jones Original Music Desmond Dickinson Cinematographer Tristam Cones Film Editing Sally Nicholl Casting George Provis Art Director