There have been a plethora of books on Bletchley Park and the crucial part it played in the downfall of Nazi Germany. This, though, is the first to put a human face to the extraordinary ordinary people who toiled tirelessly to crack the intercepted enemy codes and help turn the Second World War in the Allies' favour. Through a series of interviews with those who worked at the intelligence centre in the nondescript Buckinghamshire town, Sinclair McKay has been able to breathe new life into a well-mined story. Bound by the Official Secrets Act, many had not spoken about their war-time roles before; indeed, so assiduously did they follow the letter of the Act, relatives went to their graves thinking their offspring had somehow shirked their patriotic duties during the conflict, rather than being unsung, anonymous heroes. A book that deserves to sit alongside more scholarly offerings on the shelf.