Kathleen Bell is devastated when her boyfriend, Weston Stevenson, stands her up at Magenta High's fall dance. The next Monday, he publicly accuses her of hiding her family's history of mental illness and breaks up with her. To make matters worse, school bully Marjorie Nguyen proudly claims credit for exposing Kathleen's painful secret.

Heartbroken and struggling to make sense of her mother's death, Kathleen finds comfort in Ryan Harte, a friend she met at the dance. As Ryan confides a painful secret of his own, their friendship deepens into something neither of them expected. But while Ryan helps Kathleen look toward the future, she can't stop searching for answers about her past.

Then, a shocking family secret turns Kathleen's world upside down, forcing her to question everything she thought she knew about Marjorie, her mother, and herself. As senior year draws to a close, Kathleen must decide whether she can let go of the pain and resentment that have consumed her, or whether the truth will change her life forever.