Mad Gods: Predatory Ethics: Book 1 (Volume 1)

I was totally enthralled. I have read many books on the Templars, the Vatican and the Illumaniti, and this is one of the best. Period.
Elliot Malach

Constantine Paleologos does things grudgingly. As a descendant of Byzantine royalty he dutifully returns to Istanbul, the city his family lost centuries before. He is then set on a life-altering course against Satanists, Templars and Dark Nobility to kidnap the Antichrist. Each faction wants to raise the Beast but only Constantine wants to give him the freedom to choose his own destiny.

Mad Gods is the most high-stakes "nature vs nurture" experiment in history. An occult thriller of one man against the End of the World.

Pixel Acclaim for Mad Gods
Athanasios weaves a great sense of historical reality within a tense quick rambling story close enough to reality to be chilling.
Vincent R. Colucci

Think 300 with some Clive Barker and a little bit of the Exorcist thrown in for good measure. The plot will drive you to never stop reading and you will have to move to the next page.
Albert Robins III

Athanasios seamlessly weaves as intricate plot that connects an array of fascinating characters that propel the momentum of this wonderfully ambitious narrative.
Aman S Anand