The Panther by Nelson DeMille

Enjoyable but the weakest book in the series. Throughout the book the main character cracks unspoken jokes and as I didn't find them funny, it quickly became tiresome. PW Anti-Terrorist Task Force agent John Corey and his wife, FBI agent Kate Mayfield, have been posted overseas to Sana'a, Yemen - one of the most dangerous places in the Middle East. While there, they will be working with a small team to track down one of the masterminds behind the USS Cole bombing: a high-ranking Al Qaeda operative known as The Panther. Ruthless and elusive, he's wanted for multiple terrorist acts and murders - and the U.S. government is determined to bring him down, no matter the cost. As latecomers to a deadly game, John and Kate don't know the rules, the players, or the score. What they do know is that there is more to their assignment than meets the eye - and that the hunters are about to become the hunted.