Just finished book two in the Sanctus trilogy.
 "The Key by Simon Toyne"
http://www.goodreads.com/book/show/13092142-the-key

KEYwords: danger, conspiracy, travel, archaeology, ancient relics, religion, prophecies, earthquakes, blight, plague, end of the world as we know it.

Liv Admundson holds the key to saving "all" and Gabriel is making sure the prophecy is fulfilled. They are on the run from people who have only their interests in mind; greed, cover up, money. He must deliver her to the place described in the ancient tablets before the end of the full cycle of the moon. But have others beat them to the place and for what purpose? Others are chasing them to bring her back to the Citadel.

This continuation of this story is very exciting and hard to put down. Get the three books at the same time because you will want to move on to the next book right away!