Dantalion, a beautiful 'Incubus' demon of the Goetia, once an immortal angel of God, has fallen from grace and is now condemned. He seduces a young girl named Laurel, A Religious Studies student at Yale, and a practitioner of the occult who resembles his mortal love, Lilith. Laurel's obsession with him turns from seduction to salvation when she evokes his true demonic form in the Courtyard of the Undead and he must choose between saving her mortal soul, stolen by Satan, residing in the first heaven, over his immortal redemption and rightful place within the third heaven.