When their mother falls ill during a summer holiday in France, thirteen-year-old Cecil and her siblings are left to navigate the complexities of an unfamiliar hotel environment without adult supervision. Cecil assumes the role of protector for her younger siblings while observing the unfolding relationship between her older sister, Joss, and a mysterious Englishman named Eliot. The narrative framework follows Cecil’s perspective as she attempts to reconcile her childhood innocence with the adult secrets she begins to uncover. The setting of the French chateau serves as a claustrophobic backdrop, heightening the tension as the children are forced to rely on their own limited judgment.

Readers frequently highlight the author's ability to capture the specific anxieties and observations of a young girl thrust into adult situations. Discussion often centers on the unsettling nature of the relationship between the children and the mysterious Eliot, which provides a constant undercurrent of tension throughout the story. Critics often praise the prose for its sensory detail and the effective way it portrays the loss of innocence. The book is widely recognized for its psychological depth and the nuanced way it handles the shifting power dynamics within the family unit.