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.

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Main Cast: Will Hay, John Mills, Basil Sydney, Felix Aylmer, Thora Hird, Henry Hewitt, Owen Reynolds, Frank Cellier, Joss Ambler, Frank Allenby

Directors: Basil Dearden, Will Hay

Writers: Angus MacPhail, John Dighton

Editor: Ray Pitt

Cinematographers: Günther Krampf, Eric Cross

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