A vicious attack at a ranch in California thrusts archaeologist Erin Granger back into the fold of the Sanguines, an immortal order founded on the blood of Christ and tasked with protecting the world from the beasts haunting its shadows and waiting to break free into the sunlight. Following the prophetic words found in the Blood Gospel--a tome written by Christ and lost for centuries--Erin must again join forces with Army Sergeant Jordan Stone and the dark mystery that is Father Rhun Korza to discover and protect a boy believed to be an angel given flesh.