Oleg Gordievsky was a spy like no other. The product of a KGB family and the best Soviet institutions, the savvy, sophisticated Russian eventually saw the lies and terror of the regime for what they were, a realization that turned him irretrievably toward the West. His KGB career took flight in Copenhagen in 1966 and eventually brought him to the highest post in the KGB's London station--but throughout that time he was secretly working for MI6, the British intelligence service. Gordievsky was a spy of tremendous consequence. As the Cold War heated up in the era of Ronald Reagan and Margaret Thatcher, he provided critical information that foiled Soviet plots, exposed spies in the West, and ultimately avoided catastrophic nuclear escalation between the great powers. When Thatcher declared in 1984 that Mikhail Gorbachev was 'a man one could do business with,' it was largely because of information provided by Gordievsky. No Western country had ever run a spy so high up in Russian intelligence, which is why MI6 fiercely guarded Gordievsky's identity, even from the CIA. But the American spy agency was bent on discovering the British source, unaware that their head of counterintelligence--Aldrich Ames--was secretly spying for the Soviets. A riveting story of intrigue set in the Cold War's twilight, The Spy and the Traitor: the Greates Espionage Story of the Cold War sounds frightening echoes of today, when Russian spies are once again front-page headlines and superpower conflict dominates the globe. Writing with deep access to all of the key players in a drama that has never before been fully revealed, Ben Macintyre has produced a masterpiece of narrative nonfiction, a thrilling tale of impossibly high stakes and one man's brave gamble on his belief in democracy and freedom.