Terence Morgan

Inspector Ralph Brown

Yolande Donlan

Jill Wilson

Anthony Oliver

Inspector Newcombe

André Morell

Robert Isaac Pitt

Reginald Beckwith

Harold

Ursula Howells

Antonia Pitt

Guido Lorraine

Pietr Revski

Basil Dignam

Wing Commander Riddle

Raymond Rollett

Sir Robert Rosper

Fred Johnson

Professor Robinson-Heston

Arnold Marlé

Karl Kopek

Mark Dignam

Prison Governor

John Horsley

Assistant Commissioner

Barry Lowe

Eric Colter

Diana Lambert

Young Woman

Petra Davies

Pitt's Maid (uncredited)

Brown Derby

Police Sergeant (uncredited)

Michael Godfrey

Chertwell Security Guard (uncredited)

Arthur Lovegrove

Nick (uncredited)

Louis Matto

Waiter (uncredited)

Guy Mills

Brown's Driver (uncredited)

Stuart Mitchell

Head Waiter (uncredited)

Jim Brady

Nick's Thug (uncredited)

Cyril Renison

Detective Sergeant Enders (uncredited)

Val Guest

Director

Val Guest

Screenplay

Leonard Mosley

Novel

Val Valentine

Screenplay

Bernard Lewis

Camera Operator