"A US newsman and a British entomologist spy on germ-warfare research in a mythical country."
Margaret Lockwood
as Frances Gray
Dane Clark
as Bill Casey
Marius Goring
as Commandant Anton Razinski
Naunton Wayne
as Mr. Hedgerley
Wilfrid Hyde-White
as Mr. Luke
Eugene Deckers
as Alf
Olaf Pooley
as Detective-Interrogator
Gladys Henson
as Attendant
Paul Hardtmuth
as Priest
Michael Hordern
as Lab Director Owens
George Benson
as Sandwich Stand Customer
Eric Pohlmann
as Joe - the bartender
John Horsley
as Customs Officer
Patric Doonan
as Customs Man
Joan Haythorne
as Judy
Jill Balcon
as Wardress (uncredited)
Hyma Beckley
as Café Mimosa Patron (uncredited)
John Boxer
as Police Sergeant at Customs Café (uncredited)
Ernest Butcher
as Tom - Lab Assistant (uncredited)
Daniel Brown
as Train Passenger (uncredited)
Robert Cawdron
as Soldier at Station Checkpoint (uncredited)
Anton Diffring
as Officer at Station (uncredited)
Toni Frost
as Stewardess (uncredited)
John Gabriel
as Night Field Telephone Officer (uncredited)
Charles Hammon
as Train Passenger in Platform Line-up (uncredited)
Philo Hauser
as Waiter (uncredited)
John G. Heller
as Soldier at Station Check Point (uncredited)
Noel Johnson
as Frank Conway (uncredited)
Sam Kydd
as Customs Man (uncredited)
Richard Marner
as Soldier on Train (uncredited)
Louis Matto
as Café Mimosa Waiter (uncredited)
Anthony Newley
as Operator (uncredited)
Michael Ritterman
as The ‘Tail’ (uncredited)
Lance Secretan
as Alan (uncredited)
Dinah Sheridan
as Train Passenger at Checkpoint (uncredited)
Ewen Solon
as Enemy Scientist (uncredited)
Emile Stemmler
Robert Vossler
as Day Sentry at First Checkpoint (uncredited)
John Wilder
as Customs Officer (uncredited)
Billy Wilmot
as Café Mimosa Customer (uncredited)
Roy Ward Baker
Director
Eric Ambler
Writer
Antony Darnborough
Producer
Earl St. John
Executive Producer
Richard Addinsell
Original Music Composer
Reginald H. Wyer
Director of Photography
Alfred Roome
Editor
