Mireille Molyneux is a police inspector in Paris. A "cop", as these new cops call her between them; they look more like outsiders only to representatives of the order. Besides, it plays tricks on her since we take her for a prostitute. Mireille took sympathy for Yasmine, a little whore who wants to get out of it. Mireille has set a trap for Charlie, the young woman's pimp. But what Mireille does not know is that she is followed by sons of the I.G.S. She was reported by a pimp who accused her of extorting girls. At the same time as Charlie, she arrests a tall black guy, actually an I.G.S. cop, Inspector Blaise Lacroix. The young man will understand that Mireille is not corrupt.