DEMON BLOOD is an excellent installment to Brook's Guardian series. However, despite her thorough introduction to demons, Guardians, vampires, and the characters in her fascinating interpretation of the world, the novel encourages one too much for the previous five books. Instead of allowing questions about character development to detract from this detailed and well-developed novel, one should acquire the entire series and read them back-to-back for the most fulfilling experience. The exposition does allow the work to stand on its own, but the revelations and relationships within DEMON BLOOD are more meaningful after the other books. In Brook's world, those who selflessly sacrificed their lives for another against a paranormal threat became a Guardian; but that is just the tip of the elaborate backstory that pits Rosalia the Guardian and Deacon the vampire against demons and encourages them to break the Rules.