John Mills
— Phillip Davidson
John McCallum
— Supt. Bob Lowther
Elizabeth Sellars
— Fay Lowther
Eva Bergh
— Ilse
Geoffrey Keen
— Craig
Michael Martin Harvey
— Jackson
John Chandos
— Boyd
John Slater
— Pewsey
Thora Hird
— Mrs Pewsey
Vida Hope
— Alice Gedge
John Glyn-Jones
— Gedge
Mary Mackenzie
— Gladys
Harold Lang
— Boyd's Chauffeur/Receptionist
John Horsley
— Bletchley
Fred Johnson
— Driver
Laurence Naismith
— Hasbury
Peter Jones
— Fisher
Christopher Beeny
— Mickie
Denis Shaw
— Shaw (uncredited)