The Sacred Weapon (Tom Wagner, #1)

A previous cover edition for this ASIN can be found here

Stolen relics, a mysterious power with an evil plan and allies with questionable allegiances.
The Notre Dame fire, the theft of the Shroud of Turin and a terrorist attack on the legendary Meteora monasteries are just the beginning. Fear has gripped Europe.

Tom Wagner, an officer in the anti-terror squad "Cobra", is trapped in an endless series of routine jobs and drills–until he finds himself in the middle of an international conspiracy. Suddenly he is in a race against time, trying to prevent a disaster that could tear Europe down to its foundations. And there’s no one he can trust…