After nearly losing his life in Antigua during a mission that went terribly wrong, Gideon trusts no one. But when a former lover, a grifter named Arizona, resurfaces in need of his skills, she reminds him he is indebted to a man who had once saved his life: the son of the legendary con man Scamz. Gideon is forced to take on an assignment that will lead him to Argentina in pursuit of a briefcase containing one part of a larger puzzle. The “package” contains material that another group of assassins—the Four Horsemen of the Apocalypse—will kill for to obtain and protect. One of the leaders of the Four Horsemen has a connection to Gideon of which neither man is aware—a connection that will be exposed when they meet face-to-face and gun-to-gun.