Eli Thompson has witnessed many disturbing things in his life. When he receives a vision of despicable acts and isn’t sure what to do until a voice tells him that he needs to leave his comfortable home in Wyoming and go to Denver. Upon his arrival, Eli still doesn’t know why he’s there until his senses lead him to a restaurant in LODO where a grisly act has occurred.

After Detective Jonas Wechsler arrests Eli for being at a crime scene, they discover that other crimes involving a vanishing perpetrator are entwined with the same Fallen Angel, Agrat bat Mahlat, who desires to bring about change to the world by sacrificing men to Samael. Quickly, they learn that there are other players in this vile plan, one a pawn to carry out the Fallen Angel’s orders and two siblings, who were separated at birth.

Against heir Watchers’ wishes, Eli and Jonas decide to confront Agrat, finding themselves in a precarious predicament.