THE TRINITY SIX, by Charles Cummings

It had long been thought there were more than the notorious five British spies recruited at Cambridge by Russia’s KGB: was there a sixth? One that was never uncovered? University professor Sam Gaddis, an expert on Russian history, stumbles onto provocative but partial proof when a close journalist friend dies unexpectedly. Sam, eager to augment his income to support his distant daughter (and keep the roof over his head), leaps at the chance to write the best-seller the subject would become. At once, he’s drawn into a shadowy world of assassins, spies, and an enigmatic, masterfully manipulative 92-year old former spook with a story to tell. And then, as Sam follows clues from Moscow to Vienna, the body count rises…A 4.