In reading order
The Vivaldi Cipher
Gary McAvoy
The Opus Dictum
Gary McAvoy
The Petrus Prophecy
Gary McAvoy, Ronald L. Moore
The Avignon Affair
Gary McAvoy, Ronald L. Moore
The Jerusalem Scrolls
Gary McAvoy
The Galileo Gambit
Gary McAvoy
The Confessions of Pope Joan
Gary McAvoy
The Celestial Guardian
Gary McAvoy
The Apostle Conspiracy
Gary McAvoy
The Hildegard Seeds
Gary McAvoy
The Voynich Codex
Gary McAvoy
The Medici Heresy
Gary McAvoy