The Defector: The Untold Story of the KGB Agent Who Saved MI5 and Changed the Cold War

The untold account of how, in 1971, the defection of a KGB saboteur in London led to the rescue of MI5 after a series of disastrous intelligence failures.

Drawing 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 ...