Not quite as good as McKay's The Secret Listeners, I think, but still a well-written and interesting exploration of life for the code-breakers in Bletchley Park - with a solid emphasis on that life, to the detriment of details about the code-breaking. On the one hand, that's a bit sad for me as I like the maths and science background in books like these, but on the other it's still very interesting to read first-hand accounts from the people working at BP about their billets, for example, or how they spent their leisure hours. It does give a sense of historical context that is often lacking from more typical science histories, to be fair.