The Seraphim Code — Robert Liston

Sloane had left the Central Security Agency and made it clear to everyone that he was out of it. Completely. And while he may not have been believed-there were people keeping a watch on him- he'd given no evidence of being a problem. Until a KGB agent dies on Sloane's suburban doorstep... and someone takes a shot at him. Now Sloane's running again, a target of both U.S. and Soviet intelligence services. The dying man had told him something, whispered the words Seraphim Code to him, and those are words no one was supposed to hear, words known only to The Committee. Whhile the retired spy runs for his life on land, helped only by his wife Freddy, a Russian submarine, carrying a full load of nuclear missiles, runs silently beneath the waters of the Atlantic, cruising toward an unexpected rendezvous with disaster....