Following the murder of her younger sister, Nica, Grace embarks on a desperate search for the truth that forces her to confront the hidden life of a sibling she thought she knew. Grace struggles to navigate the social hierarchies of an exclusive New England prep school while grappling with the void left by her sister's death. The narrative, delivered through a first-person perspective, tracks Grace's transition from a passive observer of her sister's life to an active investigator of her demise. She faces resistance from the insular school community and the weight of her own grief as she peels back layers of secrets that Nica kept from her.

This novel presents a somber examination of grief and the complexities of sibling relationships within a high-pressure academic setting. The narrative style leans into the atmospheric tension of its prep school backdrop, creating a sense of isolation that mirrors the protagonist's internal state. Readers often note the focus on the psychological unraveling of the narrator as she attempts to reconcile her memories of her sister with the reality of the murder. The book functions as a character study that prioritizes the emotional stakes of the investigation over conventional procedural elements.