The Inquisitor's Key by Jefferson Bass, 353 pages

Dr. Bill Brockton has been called to France to help his assistant, Miranda Lovelady, identify the bones found in a chest discovered a chamber in the Palace of Popes. The writing on the chest has a stunning claim, it contains the bones of Jesus of Nazareth. It seems that Dr. Brockton is not the only one trying to figure out the mystery, there seems to a deadly chase to gain possession of these bones. Will Miranda and Dr. Bill survive long enough to figure just whose bones these are?

This was a pretty good book in the series, with a lot of early papal history. Enjoyable on it's own, but I really recommend reading these in order.