A. J. Lewinter, a balding (in spite of the twelve bottles of Head & Shoulders he takes with him) ceramics engineer (nose cones), crosses over to Russia and it seems impossible to believe the USSR would take him in -- he hasn't that much to offer. Nor does his explanation, fear or a preemptive nuclear war on the part of the U.S., seem very urgent. His older and newer compatriots attempt to process the either/or, true/false/positive/negative factors via all kinds of dossier data, transcripts and checks and among them you'll find a KGB representative, a grandmaster, the CIA's Leo Diamond who's as adamantine as his name, and his Sarah, a ""glutton for experience"" but not the kind she's going to get. Littell's first in this category is politically sophisticated, literate and versatile in its range and you'll want to authorize it instantly as bright entertainment.