At 13, Ursa, Hannah, Linney, and Maeve live in their own world built of basements, secrets, loves, and backyard ghosts — until the last sleepover of the summer. High school looms, with the promise and threat of reinvention, and the group fractures as shifting beliefs and identities collide in a traumatic accident that none of them can explain. Four years later, questions and accusations fly as the survivors revisit the scene of the “crime” and try to understand what happened, what they have lost, and how to live now.