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.
Dominique is a pretty, vivacious girl. When she witnesses a car theft, she throws herself and her bicycle under the vehicle. Jacques Mareuil, whom she then blackmails, pays her a sum to cover her debts. In reality, Mareuil, a policeman, is keeping an eye on Atcheminov, the owner of the car, but, wanting to prove that he is an unscrupulous trafficker, he comes up against Dominique's impetuosity time and again. It all ends up like in a good comedy.