Endearing, self-absorbed, seventeen-year-old Cécile is the very essence of untroubled amorality. Freed from the stifling constraints of boarding school, she joins her father - a handsome, still-young widower with a wandering eye - for a carefree, two-month summer vacation in a beautiful villa outside of Paris with his latest mistress, Elsa. Cécile cherishes the free-spirited moments she and her father share, while plotting her own sexual adventures with a 'tall and almost beautiful' law student. But the arrival of her late mother's best friend, Anne, intrudes upon a young girl's pleasures. And when a relationship begins to develop between the adults, Cécile and her lover set in motion a plan to keep them apart.