To Speak in Lifeless Tongues — David Niall Wilson

Still bent on obtaining the Holy Grail generations after his time in the Holy Land, Montrovant receives word that the Knights Templar are about to fall. Whether spurred to action by an old loyalty to the Order that he founded or the rumor that biblical treasures lie hidden in the recesses of the Templars' castle, the vampire known as the Dark One, sets off to the rescue. Enroute, Montrovant must deal with the trickery and unfathomable machinations of Santos, the dark guardian of lost treasures who advises the Knight from the bowels of their castle; Kli Kodesh, an ancient Nosferatu whose desire for entertainment often overlooks the lives lost to win his pleasure; and eve
Eugenio, Montrovant's own sire. Montrovant and his companions -- including a woman he nearly Embraced centuries ago -- race against time and the arrival of a Church-sponsored army sworn to destroy the now corrupt Templars to wrest the Grail free of those who would keep it hidden.