"Bonjour Tristesse" is a novel written by French author Françoise Sagan, published in 1954. The story follows a young girl named Cécile who spends her summer vacation with her father, Raymond, on the French Riviera. Their carefree lifestyle is disrupted when Raymond's new girlfriend, Anne, arrives, leading to a series of emotional conflicts. The novel explores themes of love, jealousy, and the complexities of human relationships. Cécile's desire for freedom clashes with Anne's more traditional values, ultimately resulting in a dramatic and tragic conclusion. "Bonjour Tristesse" is celebrated for its lyrical prose and insight into youthful emotions.