Olen Steinhauer’s 2009 thriller, “The Tourist,” introduced a tantalizing new word to the lexicon of espionage fiction. Steinhauer’s “Tourists” are members of a tiny fraternity of C.I.A. operatives who move ceaselessly around the world, cultivating informers, ferreting out double agents and assassinating America’s enemies. Like black-ops versions of Ryan Bingham, the corporate hit man played by George Clooney in “Up in the Air,” these covert agents exist unencumbered by relationships or…