The League of Night and Fog by David Morrell
Saul and his wife are in hiding in Israel having survived the Brotherhood of the Rose. Drew is exiled in Egypt to escape the Fraternity of the Stone. Forced to pursue old CIA contacts, their paths converge in the Vatican gardens. Together they must confront the League of Night and Fog. The author has written "The Brotherhood of the Stone" and "The Fraternity of the Stone" as well as seven other novels including "Blood Oath", "Testament", "First Blood", "Rambo: First Blood Part II" and "The Totem".