Maggie Connolly has yet to develop her magical Talent. A late bloomer, her parents tell her. As the teasing she endures from her classmates worsens, Maggie realizes she can repel the magic of the half-demon Kody, who insists that her ability proves she has either angelic or demonic heritage. Desperate for answers, Maggie forms an unlikely alliance with Kody, who once mocked her as much as everyone else. With his help, Maggie begins to manifest a power she cannot control. Soon, Maggie is the focal point of a long-prophesied war between the angels and the demons, and she will have to choose her side.