Born into a world where secret bloodlines shape history and ancient angels rot in human bones, Marcus Moon has one job: locate a descendant of Lilith and use her to cage the fallen angel Samael-before Samael fully awakens and devours him from the inside out. Marcus thinks he's in control. Until he meets Leah Water-the last unbroken thread of Lilith's bloodline. Her presence nearly unseals Samael, triggering a deadly chain reaction: the world's most powerful Keepers converge to capture her, each one willing to kill or corrupt to claim her power. Torn between duty and desire, Marcus must choose to sacrifice the girl he's falling for-or risk unleashing the very evil he was born to contain. As rival blood-heirs circle and betrayals fracture his family, Marcus uncovers a chilling truth: he was never meant to survive this. His uncle has turned him into a pawn in a rebellion to overthrow the shadowy Council that manipulates world events from the dark. Worse still, Leah was never supposed to be found. Now, hunted by those who made him, Marcus does the unthinkable-he lets Samael in. Just for a moment. Just long enough to protect her. But the more he tastes the power, the more he wonders: is the monster inside him... the only part that was ever free? Love. Power. Sacrifice. He was told he had to choose. He chooses neither. He chooses her.