Will Hay (Director) · Basil Dearden (Director) · John Dighton (Screenplay) · Angus MacPhail (Screenplay)
Will Hay
Prof. Davis
John Mills
Bobby Jessop
Basil Sydney
Costello
Felix Aylmer
Crabtree
Thora Hird
Joyce
Henry Hewitt
Prof. Davys
Owen Reynolds
Harman
Frank Cellier
Innsbach
Joss Ambler
Sir John
Frank Allenby
Onslowe
Margaret Halstan
Matron
Barbara Valerie
Sister Spooner
Leslie Mitchell
B.B.C. Interviewer
George Woodbridge
Male Nurse
George Merritt
Station Master
Aubrey Mallalieu
Ticket Collector
Diana Beaumont
Sister at Nursing Home
John Boxer
Hotel Receptionist
Cyril Chamberlain
B.B.C. Producer
Richard George
Hospital Nurse
Kenneth Griffith
Butcher's Boy
Dorothy Hamilton
Miss Rudge
Roddy Hughes
Journalist
Katie Johnson
Train Passenger
Agnes Lauchlan
Mrs. Webster
Brefni O'Rorke
Ministry Receptionist
Marjorie Rhodes
Nurse
Ronald Shiner
Porter
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A professor teaching at a correspondence school discovers that a Nazi agent is trying to prevent a trade treaty being signed between England and South America.
