Rex Harrison as Arthur Groome

Lilli Palmer as Mary Groome

Tania Heald as Sheila Groome

Henrietta Barry as Rosemary Groome

Dora Sevening as Mary's mother

Ronald Simpson as Mary's father

Anthony Dawson as The Man

Brenda De Banzie as Mrs Rogers

Ballard Berkeley as Supt. Maxey

Raymond Huntley as Chief Inspector Sullivan

William Squire as Sergeant Cochcran

Denis O'Dea as Sir Charles Morton

Anthony Bushell as Clive Bedford

Henry B. Longhurst as Judge

Patricia Cutts as Rose Mallory

Meriel Forbes as Marjorie Danns

Douglas Jefferies as Dr Conway

Michael Medwin as Leslie Scott

Colin Gordon as Pound

Lionel Murton as Jefferson

Eric Pohlmann as Mr Polaris

Jenny Laird as Mrs Sims

Frank Tickle as Alfred Tripp

Lilli Molnar as Mrs Polaris

Jill Bennett as 1st Murdered Girl

Fletcher Lightfoot as Jury Foreman

Anthony Shaw as Clerk of the Court

Tom Macaulay as Ironworks Manager

Richard Littledale as Mr. Sims

Tony Quinn as Joe

Ernest Blyth as Court Clerk (uncredited)