Based on

Movies like Light behind the Shutter (1966)

Torday Géza, a new engineer arrives at the ammunition factory disguised as if manufacturing camping gears. His appearance upsets existing patterns. The director sells the products at a low price in the West. In the meantime diversionaries attempt to destroy the plant. It turns out that Torday is a man of the intelligence built in among the reconnaissance people, as is his childhood lover, Magda. Agents and policemen play the game.