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C. J. Sansom: Dominion (2013, Pan Books, Pan Macmillan)

At once a startling, sinister reimagining of 1950s Britain and a gripping, humane spy thriller, …

Review of 'Dominion' on 'Goodreads'

A good read and the alt-history is excellently argued and described. But I can't help thinking the American OSS/CIA would have just bumped Frank off. They would have had agents in Britain.