Eighteen-year-old Scarlet Rose has grown up never staying in one place for too long. The night before her next move she sneaks out, and when she comes home her father orders her to run. Confused and scared, Scarlet's world is turned upside down when a half-Angel vows to keep her safe.Theo's spent his whole life following the rules of the Nephilim until he makes a promise he will break all the rules to keep.Thrust into the world of Angels, Demons, Nephilim, and Hellborne Scarlet and Theo create a bond built on a Guardian's vow and a young woman's determination.