Stephen Hunter

Bob Lee Swagger is a master marksman who has retreated from his duty as an off-the-books hired gun for the military. He has become disillusioned with his government, but finds that the government needs Swagger to scope out the location of a rumored attempt on the life of the president. A shadowy government operative begs Swagger to use his sniper's skills to out-fox the assassin. Ultimately he is double-crosses and framed for the attempted assassination....