On Target (Gray Man, #2)

Killing is Court Gentry's business. Now, his business is about to get personal in the second Gray Man novel from #1 New York Times bestselling author Mark Greaney.
Four years ago, Court Gentry was betrayed by his handlers in the CIA. To survive, he had to eliminate his own brothers in arms. Now, as a master assassin known as the Gray Man, he makes his living killing other people. But when an old comrade he thought dead returns to haunt him, his own life is put in the crosshairs.