Sixteen-year-old Devon Mackintosh has always felt like an outsider at Keaton, the prestigious California boarding school perched above the Pacific. As long as she's not fitting in, Devon figures she might as well pad her application to Stanford's psych program. So junior year, she decides to become a peer counselor, a de facto therapist for students in crisis. At first, it seems like it will be an easy fly-on-the-wall gig, but her expectations are turned upside down when Jason Hutchins (a.k.a. 'Hutch'), one of the Keaton's most popular students, commits suicide.

Devon dives into her new role providing support for Hutch's friends, but she's haunted by her own attachment to him. The two shared an extraordinary night during their first week freshman year; it was the only time at Keaton when she felt like someone else really understood her. As the secrets and confessions pile up in her sessions, Devon comes to a startling conclusion: Hutch couldn't have taken his own life. Bound by her oath of confidentiality—and tortured by her unrequited love—Devon embarks on a solitary mission to get to the bottom of Hutch's death … and the stakes are higher than she ever could have imagined.