Ritually murdered corpses are appearing across Cincinnati, terrifying amalgams of human and other.

Pulled in by the FIB to help investigate, former witch-turned-day-walking demon Rachel Morgan soon realizes a horrifying truth: others want to create their own demons, and to do so they need her blood.

She’s faced vampires, witches, werewolves, demons, and more-but this time Rachel’s toughest challenge might be humanity itself.