Lucy Sharpe is larger than life. Especially for shy, unassuming Margot, who meets Lucy at the end of their freshman year at a liberal arts college in South Carolina. But when Lucy asks her to room together, something in Margot can't say no. And so she finds herself living in an off-campus house with three other girls: Lucy, the ringleader; Sloane, the sarcastic one; and Nicole, the nice one. It's a year that finds Margot finally coming out of the shell she's been in since the end of high school, when her best friend Eliza died three weeks after graduation. Margot and Lucy have become the closest of friends, but by the middle of their sophomore year, one of the fraternity boys from the house next door has been brutally murdered...and Lucy Sharpe is missing without a trace.

One year ago, Isabelle Drake's life changed forever. Her toddler son, Mason, was taken out of his crib in the middle of the night while she and her husband were asleep in the next room. With little evidence and few leads for the police to chase, the case quickly went cold. However, Isabelle cannot rest until Mason is returned to her. In hopes of jarring loose a new witness or buried clue, she agrees to be interviewed by a true-crime podcaster --- but his interest in Isabelle's past makes her nervous. His incessant questioning paired with her severe insomnia has brought up uncomfortable memories from her own childhood, making Isabelle start to doubt her recollection of the night of Mason’s disappearance, as well as second-guess who she can trust...including herself.

When Chloe Davis was 12, six teenage girls went missing in her small Louisiana town. By the end of the summer, her own father had confessed to the crimes and was put away for life, leaving Chloe and the rest of her family to grapple with the truth and try to move forward while dealing with the aftermath. Now, 20 years later, Chloe is a psychologist in Baton Rouge and getting ready for her wedding. While she finally has a fragile grasp on the happiness she’s worked so hard to achieve, she sometimes feels as out of control of her own life as the troubled teens who are her patients. So when a local teenage girl goes missing, and then another, that terrifying summer comes crashing back.