I was lucky enough to get a review copy of Innocent Blood, by James Rollins and Rebecca Cantrell, and I must say that I really enjoyed it, though not as much as I enjoy Rollins' Sigma Series.
The premise for this series is that the Vatican has a secret sect of vampiric priests known as the Sanguinists. They are tasked with, among other things, killing or converting the evil rogue vampires.
The plot revolves around a human archeologist, a human soldier, and one of the Sanguinists. In the previous volume, this trio recovered the Blood Gospel, which was written by Jesus in His own blood. In this volume, they are attempting to use the Gospel to prevent the apocalypse, which is being caused by an immortal Judas Iscariot.
The story has plenty of action and mysteries. I thoroughly enjoyed it, but some may be turned off by the Catholic worldview of the story.