Tom Clancy's Support and Defend

Back in Washington, it's clear a mole has been gathering and leaking US secrets. And Caruso is desperate to avenge his friend. Soon he is on the tail of NSC-staffer Ethan Ross - a man who thinks he's too smart to ever get caught.
Unfortunately, Ross has got many more secrets on a microdive, and when he decides to run, it's not just Caruso and the FBI on his trail. The Russian and a few angry terrorist groups will do anything to get to Ross - and the vital information he carries.