Ray Milland as Mark Bellis

Ann Todd as Olivia Harwood

Geraldine Fitzgerald as Susan Courtney

Leo G. Carroll as Jarvis

Raymond Huntley as Henry Courtney

Martita Hunt as Mrs. Courtney (SR)

Moira Lister as Kitty Feathers

Raymond Lovell as Edgar

Roderick Lovell as Sir John Curle

Muriel Aked as Miss Shoebridge

Finlay Currie as Dr. Krylie

Maureen Delaney as Curtis

Ivor Barnard as Mr. Watson

Ernest Jay as Smathers

Hugh Griffith as Coroner

Zena Marshall as Lizette

Eliot Makeham as Mr. Helliwell

Guy Le Feuvre as Dr. Pound

Vincent Holman as Rogers

Chris Halward as Alice

John Wilder as Footman

Leonie Lamartine as Proprietress

Clarence Bigge as Dr. Cunningham