Rex Harrison
— Arthur Groome
Lilli Palmer
— Mary Groome
Tania Heald
— Sheila Groome
Henrietta Barry
— Rosemary Groome
Dora Sevening
— Mary's mother
Ronald Simpson
— Mary's father
Anthony Dawson
— The Man
Brenda De Banzie
— Mrs Rogers
Ballard Berkeley
— Supt. Maxey
Raymond Huntley
— Chief Inspector Sullivan
William Squire
— Sergeant Cochcran
Denis O'Dea
— Sir Charles Morton
Anthony Bushell
— Clive Bedford
Henry B. Longhurst
— Judge
Patricia Cutts
— Rose Mallory
Meriel Forbes
— Marjorie Danns
Douglas Jefferies
— Dr Conway
Michael Medwin
— Leslie Scott
Colin Gordon
— Pound
Lionel Murton
— Jefferson
Eric Pohlmann
— Mr Polaris
Jenny Laird
— Mrs Sims
Frank Tickle
— Alfred Tripp
Lilli Molnar
— Mrs Polaris
Jill Bennett
— 1st Murdered Girl
Fletcher Lightfoot
— Jury Foreman
Anthony Shaw
— Clerk of the Court
Tom Macaulay
— Ironworks Manager
Richard Littledale
— Mr. Sims
Tony Quinn
— Joe