The peasant Adémaï, returning home, gets lost in the forest and knocks down a border post. In his haste to replant it, he installs it upside down.
A young French, Vignerte, is hired in the court of Lautenberg, an imaginary land, as the young Prince's private teacher and as the Grand Duchess' reader.
Elvire, Nathalie and Christine, three young ladies with a proven track record, are called in by the Secret Service to retrieve coveted papers concerning a new explosive. Introduced to a fearsome environment thanks to a female helper, they face kidnappings, play a double game, toil endlessly, lend helicopters and finally triumph, smiling, after a breathtaking fight.
