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This is more a "secret history" than a full alternative history, as it takes the premise that McCarthy was always a willing Soviet agent and his real witch-hunts were a disinformation strategy. Pulling this off would take a lot of research and a very strong handle on the period & personalities, and Kresal has got all of this going for him here. The research and the invocation of the time - both in the US and USSR - almost makes it feel plausible, which is pretty good work when we _know_ the premise is made up!
McCarthy himself is a fascinatingly loathsome yet three-dimensional figure, driven by ego and a bitter sense he's _owed_ prominence after all the (legitimate) work he's put in, that he can't end it as an also-ran. You can almost feel sorry for him but you still don't want the git to win or be near you!