In the fall of 1963, Anne is becoming a teenager. She lives in Paris with her mother and her older sister, Frédérique. They're just back from summer at the beach with their father. School starts. A turbulent year awaits them both.
Arnolphe plans to marry Agnès, his ward, a naive and submissive young girl, whom he keeps recluse in a convent. His plans are threatened when Horace confesses his feelings for Agnès.