From crumbling tombs to splendorous churches, Erin and her companions must confront a past that traces back to a time when ungodly beasts hunted the dark spaces of the world, to a moment in history when Christ made a miraculous offer, a pact of salvation for those who were damned for eternity—creating a secret sect within the Vatican, one whispered as rumor but whose very existence was painted for all to see by Rembrandt himself, a shadowy order known simply as the Sanguines.