Benjamin Cunningham's book The Liar—an engrossing study of Czechoslovak spies Karel and Hana Koecher—is his first major venture into espionage history. A former journalist for The Economist, Cunningham's long assignment in Prague gave him a facility with the Czech language, assisted by translators who helped him go through Czech and Russian documents. Cunningham's use of Czechoslovak Secret Police (StB) archives lends rare credibility to this study of Cold War spies. Cunningham also conducted a series of interviews with Karel Koecher. Typically, after unmasking Soviet spies, intelligence services could only guess the extent of security compromises. After the Communist regime's demise, access to StB files eliminated such guesswork in this instance. Koecher's treachery is well documented; and the StB accumulated a large file on both Koechers. This source material enabled Cunningham to identify secrets that Koecher stole and transmitted to the StB and the Soviet State Security Committee (KGB)....

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