Dr. Julien Sauniere's quest to catch his friend's murderer concludes with the discovery of a secret society dedicated to protecting the mystery of the Holy Grail. Now in pursuit of the Grail, Julien has been betrayed by his lover and hunted by the Inquisition, and witnessed slaughters and miracles in a wild mountain valley owned by the power-mad Duke of Lorraine. Collects Rex Mundi Volumes 4-6.