A brilliant and determined female engineer is approached by a network of powerful women with an offer to help become the head of a CAC 40 firm. The conguest, which was at first thrilling, turns to complete war with the men who still dominate.

Vincent Machot knows his life by heart. He shares it between his hair dressing salon, his cousin, his cat, and his too-invasive mother. But life sometimes holds surprises, even for the most prudent of people... He crosses paths with Rosalie Blum by accident. She is a mysterious and solitary woman whom he is sure he has already met. But where? Intrigued, he decides to follow her everywhere, in the hope of knowing more about her.