Marguerite Muir is a dentist, single and middle-aged, independent and unpredictable of mood. Georges Palet is in his late 50s, married, and unemployed; he too is temperamental, and burdened by something in his past (unexplained but possibly criminal). When Georges discovers the discarded wallet from Marguerite's stolen handbag and hands it in to the police station, he allows himself to imagine the door opening to a romantic encounter. Marguerite initially has other ideas, but is later drawn towards Georges. Georges's wife Suzanne, Marguerite's best friend Josépha and two policemen are drawn into the entanglement of their lives. Georges and Marguerite share a passion for aviation, which leads to a flight with Suzanne in Marguerite's plane, while a farmer watches apprehensively from below. There is an uncertain resolution of their adventure, and the film ends with an enigmatic question from the farmer's daughter.