X, Y & Z: The Real Story of How Enigma Was Broken

This book has a really charming writing style that gives a look into what the lives of Polish codebreakers were like in this period. I do think some of the political writing is marred a bit by the participation of the Polish government (the statement that antisemitism didn't exist in Poland prior to 1939 is particularly eyeroll-worthy but also is the official party line) but overall I do think it was interesting and well-researched.