The Defector: The untold story of the KGB agent who saved MI5 and changed the Cold War - 'Reads like le Carré', Robert Verkaik

'One of the most sensational episodes of the Cold War' - Sunday TimesDrawing on newly declassified intelligence documents and dozens of interviews with spymasters, The Defector tells a startling story of a Soviet mission to plant fake Kremlin agents within British and American intelligence services, the paranoia that ensued and how the actions of a genuine turncoat, the former KGB officer Oleg Lyalin, and the secrets he revealed resulted in one of the most dramatic and pivotal moments in the Cold War. Lyalin led MI5 to rethink its relationship with the CIA. And his defection discredited a previous KGB defector, Anatoly Golitsyn, the darling of the CIA, and ultimately destroyed the reputation of the US agency's head of counterintelligence, James Jesus Angleton. As Richard Kerbaj writes: 'There was a poetic irony in Golitsyn's loss of credibility.It came, as he had previously feared, at the hands of a KGB defector.Except Oleg Lyalin had not been sent by the KGB - he was running away from