You would think that after several decades reading spy thrillers about Russia, I would know all the good ones. Then, browsing the Oxfam bookshop on the Woodstock Road in Oxford a few years ago, I came across The Cambridge Theorem.
How had I missed this for so long? The Cambridge Theorem is brilliant. What is more, it turned out —or so I thought at the time— that it was the first in a trilogy based around its central character.
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