During World War II, an intelligence officer is dispatched by the U.S. government to arrange an exchange in Argentina of industrial diamonds needed by the Germans for a secret gyroscope needed by the Allies.

Stephen Collinsas David Spaulding
Vince Edwardsas Gen. Swanson
Jeremy Kempas Geoffrey Moore
John Hustonas Ambassador Henderson Granville
Roddy McDowallas Bobby Ballard
Lauren Huttonas Leslie Jenner Hawkewood
Claude Akinsas Walter Kendall
José Ferreras Erich Rhinemann
Larry Hagmanas Col. Edmund Pace
René Auberjonoisas Dr. Eugene Lyons