John Mills as Phillip Davidson

John McCallum as Supt. Bob Lowther

Elizabeth Sellars as Fay Lowther

Eva Bergh as Ilse

Geoffrey Keen as Craig

Michael Martin Harvey as Jackson

John Chandos as Boyd

John Slater as Pewsey

Thora Hird as Mrs Pewsey

Vida Hope as Alice Gedge

John Glyn-Jones as Gedge

Mary Mackenzie as Gladys

Harold Lang as Boyd's Chauffeur/Receptionist

John Horsley as Bletchley

Fred Johnson as Driver

Laurence Naismith as Hasbury

Peter Jones as Fisher

Christopher Beeny as Mickie

Denis Shaw as Shaw (uncredited)