In 1971, John Coombs, an embittered recluse with a cancer-stricken daughter, lives on an island off the coast of Hong Kong, where he is writing a doomsday book on the future of civilisation. But he is also a top cryptoanalyst, and when the British Government asks him to decipher a code which relates to an apparent Soviet plot to assassinate Mao Zedong, he reluctantly agree
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