After five years in the Blood Moon Dungeon, half-blood heiress Lyra Vane sends her four-year-old daughter Iris to find the father she has never met. A blood resonance at Lucien Draven's coronation reveals the child as the vampire king's only heir. As an obsidian key, forged bloodblade evidence and the stolen Dawn Serum expose the truth, Lucien discovers that Lyra's betrayal was a sacrifice made to keep him alive.
