For years KGB operative Vasili Mitrokhin risked his life hiding top-secret material from Russian secret service archives beneath his family dacha. When he was exfiltrated to the West he took with him what the FBI called 'the most complete and extensive intelligence ever received from any source'. This extraordinary bestselling book is the result.

'Co-authored in a brilliant partnership by Christopher Andrew and the renegade Soviet archivist himself ... This is a truly global exposé of major KGB penetrations throughout the Western world' The Times

'This tale of malevolent spymasters, intricate tradecraft and cold-eyed betrayal reads like a cold war novel' Time

'Sensational ... the most informed and detailed study of Soviet subversive intrigues worldwide' Spectator

'The most comprehensive addition to the subject ever published' Sunday Telegraph