I have a weak spot for any Da Vinci Code clone that refers to Byzantine cathedrals, so when I saw this in the Phoenix airport I knew I had to have it. I picked it up in the Dallas airport on the way home and devoured it inside a week. I had liked its immediate predecessor Map of Bones okay, but this one was better - the historical basis was solid (enough), the characters were entertaining, the historical settings were great, and the plot and action towards the end actually built into a pretty good story. A solid B.