The means used by foreign spy services to obtain the trade secret of a French invention.
Cast:
Claude Rollet, Danielle Godet, Paul Préboist, Jacques Galland, Henri Lambert
Yves Rubin
Sonia
Léon Prades
Robert Alexandre
Dabillaud
Mario
Janine
Irène
Jean-Marc
Pierre
The man on the train
The representative
W (the spy)
