Bryan Forbes Director, Producer, Screenwriter Kim Stanley Myra Savage Actor Richard Attenborough Billy Savage Actor, Producer Patrick Magee Superintendent Walsh Actor Mark Eden Charles Clayton Actor Nanette Newman Mrs. Clayton Actor Judith Donner Amanda Clayton Actor Gerald Sim Detective Sergeant Beedle Actor Margaret Lacey Woman at First Seance Actor Maria Kazan Woman at First Seance Actor Lionel Gamlin Man at Seances Actor Marian Spencer Mrs. Wintry Actor Ronald Hines Policeman Outside Clayton's Actor Hajni Biro Maid at Clayton's Actor Diana Lambert Sheila Actor Godfrey James Mrs. Clayton's Chauffeur Actor Arnold Bell Mr. Weaver (uncredited) Actor Stanley Morgan Man in Trilby Actor Michael Lees Plain Clothes Policeman Actor Maggie Rennie Woman at Second Seance Actor Frank Singuineau Bus Conductor Actor Mark McShane Writer John Barry Music