The blueprints of an aeroplane built from an ultra-secret metal are stolen from national security. French secret service agent Walder believes that the documents are now in Switzerland, in the hands of a man named Lindbaum. The latter agrees to hand over the blueprints in return for a large sum of money. Another agent, Francis Coplan, is sent to Switzerland to handle the deal, but Lindbaum only has half of the documents because he was double-crossed by Kalpannen, an international crook. With the help of Heidi, a Swiss correspondent, Coplan sets out to identify the members of Kalpannen’s gang, only to find that they have all been murdered…
as Francis Coplan
as Hiedi Effen
as Walder
as Diana Rossi
as Bérès
as Sylvia
as Kalpannen
as Lindbaum
as Colonel
as Dr. Serutti
as Fondane
as Karl
as Gregory
as Engineer
as Friedi Fulger, photographer
as Herst
