The Templar Legacy by Steve Berry
The ancient order of the Knights Templar possessed untold wealth and absolute power over kings and popes . . . until the Inquisition, when they were wiped from the face of the earth, their hidden riches lost. But now two forces vying for the treasure have learned that it is not at all what they thought it was-and its true nature could change the modern world.
Cotton Malone, one-time top operative for the U.S. Justice Department, is enjoying his quiet new life as an antiquarian book dealer in Copenhagen when an unexpected call to action reawakens his hair-trigger instincts-and plunges him back into the cloak-and-dagger world he thought he'd left behind. Condition Good