There are 3 books in the The Child 44 Trilogy series. The newest book is Agent 6 which came out in 2011.

1
Child 44

Book cover of Child 44
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MOSCOW, 1953.
Under Stalin's terrifying regime, families live in fear. When the all-powerful State claims there is no such thing as crime, who dares disagree?

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An ambitious secret police officer, Leo Demidov believes he's helping to build the…
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2
The Secret Speech

Book cover of The Secret Speech
The Soviet Union 1956: after Stalin's death, a violent regime is beginning to fracture. Stalin's successor Khrushchev pledges reform. But there are forces at work that are unable to forgive or forget the past.

Leo Demidov, former MGB officer, is facing his own turmoil. His adopted daughters have yet to…

3
Agent 6

Book cover of Agent 6
Moscow, 1965. Former Secret Service agent Leo Demidov is forbidden to travel with his wife and daughters to New York as part of a 'Peace Tour', meant to foster better relations between the two Cold War enemies. Leo's natural paranoia reaches its peak: Why have his family been selected? What…