Cahal Kearney, the Dunmharu, asked a favor from the Maerrighan to save his friend, Maggie, and his dog, Daegen. She now calls payment due. His Fae father, a man he does not know, is captive on the world of the UnSeelie, held by the Black Queen. Surrounded by the darkest creatures of Pandaemonium. To repay his debt: rescue Sionnach, or die in the attempt. Annabeth Hughes, his girlfriend and vampire, has been asked a favor by Bishop, her sire. Travel from London to Atlanta and quell a vampire uprising. She arrives in the middle of a hostage crisis. Rogue vampires threaten to slaughter innocent humans and stream the carnage across the internet. Her favor becomes a race to rescue the hostages. Fail and vampire-human relations go to hell.