Stewart’s debut novel is the frightening story of 14-year-old social outcast, Elanor Moss. After her failed suicide attempt, Elanor's family wants to make a fresh start in New York. But a terrible car accident changes her life forever, and Elanor's near-death experience opens a door to a world inhabited by Madeline Torus. She is Elanor's alter ego and the two become fast but secret friends. Elanor remains convinced Madeline is real even though no one else can see the girl. Soon, she begins to doubt her own sanity and as Madeline becomes increasingly unstable, Elanor finds her life spinning out of control.