A vision of blood. A city under siege. An ancient evil hungry for change.
Eli Thompson is no stranger to the disturbing, but when a psychic vision of a despicable ritual shatters his peace, he can no longer remain a bystander. Guided by a mysterious voice, Eli leaves the comfort of Wyoming for the shadows of Denver. He finds himself drawn to a restaurant in LoDo, standing over a crime scene so grisly it defies logic—and puts him directly in the crosshairs of Detective Jonas Wechsler.
What Jonas first assumes is a simple arrest quickly spirals into a hunt for a vanishing perpetrator. The murders are a series of blood sacrifices to Samael, orchestrated by the Fallen Angel Agrat bat Mahlat. As the body count rises, Eli and Jonas discover they are dealing with a web of players: a mindless pawn and two siblings separated at birth with a dark role to play. Defying their celestial Watchers, the unlikely duo must confront Agrat before her vile plan transforms the world into a landscape of permanent slaughter.