An uncontrollably violent being lives within Cara and emerges when she is threatened, killing everyone around her. Between homelessness and high school, life presents constant hardship. Cara finds stability and hope when the Samuelsons take her in. Her boyfriend, Adam, looks past the scar on her face and recognizes Cara's beauty. His loyalty to her never fails. Together, they learn the ancient origin of the destructive force within her and embark on an unforgettable adventure of rescue and survival.

A secret government agency wants Cara as a weapon, with or without her consent. Meanwhile, an implacable assassin with a personal vendetta hunts Cara and her new family.

Other than Adam, Cara doesn't know who to trust. Her best hope may lie with an eccentric elderly woman, a girl genius with nothing left to lose, and ... a unique creation developed in their lab.