Stalin’s Englishman: the Lives of Guy Burgess by Andrew Lownie
This was a useful book, adding to my knowledge of an interesting time and phenomenon. It put forward a few things I had thought otherwise, eg he discounts the idea that Burgess deliberately engineered being sent home from the US so that he could warn Maclean. It seems feasible that there were other ways Maclean could be kept up to date.
I had always rather dismissed Burgess as a buffoon, but this book made me reassess this.