Francoise is beautiful, so beautiful that Jacques will never introduce her to Philippe, his childhood friend. She is married, but he does not care. He is convinced that he will be able to convince her to leave her husband. Six months later, he discovers, at his expense, that he has embarked on a story much more complex than he could ever have imagined. Françoise's husband knows about his wife's shortcomings, watches over her daily, preserves her from her excesses and delusions. Calmly, with a master's hand that will never shake, he will remove all those "butterflies" who keep approaching her.