Without seeming to touch it, journalist Trupeau is interested in the doings of Mireille, a jewelry store saleswoman. A certain Jojo is hanging around the young girl, and not for the right reasons, but to pull off a "heist". Although one of his men betrays him and has to be shot, Jojo succeeds. The police investigate, question and pursue Mireille. Exasperated and disillusioned, the pretty salesgirl shoots Jojo. Fortunately, the journalist is there to prove that she's as white as an ermine. And the ch timents rain down on the culprits.

Larry Blake is an American airline pilot who loves women and ... trouble! Wherever he goes troubles indeed follow, like this time in Paris. On vacation in the French capital, the happy American decides to discover Paris by Night. As of his first night out, he gets to know Michèle Marley, a beautiful entertainer, and looks forward to a wonderful night of pleasure. But things do not go according to plan. Indeed, Laurent, Michèle's partner is found dead and not only is Michèle accused of killing him but Larry is suspected of being her accomplice as well ...