
A US newsman and a British entomologist spy on germ-warfare research in a mythical country.

Margaret Lockwood
Frances Gray

Dane Clark
Bill Casey

Marius Goring
Commandant Anton Razinski

Naunton Wayne
Mr. Hedgerley

Wilfrid Hyde-White
Mr. Luke

Eugene Deckers
Alf

Olaf Pooley
Detective-Interrogator

Gladys Henson
Attendant

Paul Hardtmuth
Priest

Michael Hordern
Lab Director Owens

George Benson
Sandwich Stand Customer

Eric Pohlmann
Joe - the bartender

John Horsley
Customs Officer

Patric Doonan
Customs Man
Joan Haythorne
Judy

Jill Balcon
Wardress (uncredited)
Hyma Beckley
Café Mimosa Patron (uncredited)
John Boxer
Police Sergeant at Customs Café (uncredited)

Ernest Butcher
Tom - Lab Assistant (uncredited)
Daniel Brown
Train Passenger (uncredited)
Roy Ward Baker
Eric Ambler
Released