Karlheinz Böhm as Mark Lewis

Anna Massey as Helen Stephens

Moira Shearer as Vivian

Maxine Audley as Mrs. Stephens

Brenda Bruce as Dora

Miles Malleson as Elderly Gentleman Customer

Esmond Knight as Arthur Baden

Michael Goodliffe as Don Jarvis

Jack Watson as Chief Insp. Gregg

Shirley Anne Field as Pauline Shields

Pamela Green as Milly

John Barrard as Small Man (uncredited)

Robert Crewdson as Shop Assistant on Film Set (uncredited)

Nigel Davenport as Det. Sgt. Miller (uncredited)

Michael Powell as Mark's Father - A.N. Lewis (uncredited)

Susan Travers as Lorraine the Model (uncredited)

Martin Miller as Dr. Rosen

Keith Baxter as Det. Baxter (uncredited)

John Chappell as Clapper Boy (uncredited)

Roland Curram as Young Man in Sports Car (uncredited)

John Dunbar as Police Doctor (uncredited)

Maurice Durant as Publicity Chief (uncredited)

Paddi Edwards as Girl Electrician (uncredited)

Cornelia Frances as Girl in Sports Car Leaving Studio (uncredited)

Veronica Hurst as Miss Simpson - Jarvis' Secretary (uncredited)

M. Le Compte as Lover in Garden (uncredited)

Mme. Le Compte as Lover in Garden (uncredited)

Bartlett Mullins as Mr. Peters - News Agent Shop Owner (uncredited)

Pete Murray as Young Man Embracing Girl (uncredited)

Margaret Neale as Mark's Stepmother (uncredited)

Columba Powell as Mark as a Child (uncredited)

Guy Kingsley Poynter as P. Tate - Studio Cameraman (uncredited)

Frankie Reidy as Mark's Mother on Deathbed (uncredited)

Alan Rolfe as Store Detective (uncredited)

Frank Singuineau as Electrician #1 (uncredited)

Peggy Thorpe-Bates as Mrs. Partridge (uncredited)

Robert Vossler as Policeman (uncredited)

Brian Wallace as Tony - Downstairs Lodger in Lewis' House (uncredited)

Brian Worth as Assistant Director (uncredited)

Jack Carter as St John's Medic (uncredited)

Joanna Vogel as Party Guest (uncredited)