Path of the Assassin (Scot Harvath #2) by Brad Thor

Navy SEAL turned Secret Service agent Scot Harvath follows bloody clues to silver-eyed elusive ruthless terrorist Hashim Nidal, who intends to topple Israel and America, and can be identified by only one person - Meg Cassidy. Across four continents, from Macau, Jerusalem, Chicago, Libya, Capri, and Rome, the deadly puzzle tests their limits and growing bond.