Dominique, a young law student in Paris, finds her cynical worldview challenged when she enters an affair with an older, married man. Seeking to escape the monotony of her academic life and her current relationship, she pursues Luc, a man significantly her senior who represents a sophisticated, detached lifestyle. The narrative, presented through a first-person perspective, examines the friction between youthful idealism and the calculated emotional distance maintained by the older generation. As the affair progresses, Dominique must navigate the limitations of her own desires against the reality of Luc's established life and his refusal to commit.

Readers often note the clinical precision with which Sagan dissects the complexities of desire and disillusionment. Discussion frequently centers on the protagonist's transition from youthful naivety to a more hardened, cynical understanding of human connection. Critics highlight the author's ability to capture the specific atmosphere of Parisian life during the mid-twentieth century without relying on excessive sentimentality. The pacing is described as deliberate and focused, prioritizing the internal shifts of the characters over dramatic plot developments. Many readers find the narrative's refusal to offer moral judgment to be a defining characteristic of the work.