"To hell and back...Though he has vampire, demon, and Viking blood rushing through his veins, Ivar Kjeidsen's soul-crushing trip to hell broke him in ways he can barely fathom. One vow keeps the deadly immortal standing: To rescue the vampire brother who had sacrificed freedom from him. To do that, Ivar needs the help of a brilliant physicist with wary brown eyes, fierce brilliance, and skin that's way to soft..."--From back cover.