The celebrated author of A Spy Among Friends and Rogue Heroes returns with his greatest spy story yet, a thrilling Cold War-era tale of Oleg Gordievsky, the Russian whose secret work helped hasten the collapse of the Soviet Union.If anyone could be considered a Russian counterpart to the infamous British double-agent Kim Philby, it was Oleg Gordievsky. The son of two KGB agents and the product of the best Soviet institutions, the savvy, sophisticated Gordievsky grew to see hi