Top hunter Kael accidentally breaks an ancient seal and frees Chloe, the sealed Succubus Queen stripped of her memories and power. Bound by hunter creed to slay dark creatures, he defies his guild to protect her after growing tender for her thousand years of suffering.
Multiple factions hunt Chloe: greedy vampire ancestor Lucius, traitor demon lord Kane who locked her away, and fanatical hunter guild leaders. Kael forms an irreversible blood bond with Chloe, becoming her power anchor, risking his life and identity as a traitor.
After reclaiming her full strength and throne in the Abyss, Chloe strikes a truce between the Abyss, vampires and hunters. She balances her royal duties and quiet love with Kael, finally choosing to return to their humble cabin for peaceful, everlasting companionship.
