Bo is a young girl who was born with special supernatural abilities that she cannot control and,
as they start evolving, the people who are protecting her must turn to an outsider. This leads them to William Tate, a wrongfully convicted death-row inmate, whom they break out of prison. Although he is reluctant to take on the role as her protector, the two eventually form a bond that will guide them to helping each other, as well as others, while staying one step ahead of the evil forces that want the girl.