Sixteen-year-old Erin Misrahe just wants to be like everyone else in her new school. But Erin has more to worry about than passing AP Chemistry or making friends. In times of stress, she has always been overcome by her alter ego, Shevaun, whose violent behavior wreaks havoc on those around her. Erin can never remember anything about these episodes, and sheÒa€™s grateful to have been spared them for a while.