This was a riveting read about codebreaking at Bletchley Park in the second world war. British Intelligence, known as GC&CS before the war and GCHQ after the war, could crack almost any code and did. Peaking at an employment level of 10,000 in early 1945, Bletchley Park codebreakers decoded, read, and analyzed the most vital and secret transmissions by the Germans. Experts say that their work shortened the war by one to three years.
The Official Secrets Act that all Bletchley Park staff had to sign, prevented this or any book being written until at least 30 years after the war when the secrecy order was finally lifted. In addition to exceptional research, the book also provided personal recollections of numerous people who had actually worked there or been recipients of the intelligence gathered there. The research, the personal insights, and the mainly chronological narrative gave me a very good feel for the intensity of the work, the teamwork, the sense of urgency and pressure that permeated every task, every day, 24 hours a day.
Encryption and code breaking is complicated and technical, and the author presented it in such a way that I could understand why it was so hard and how it could give birth to the first electronic computers. I am a geek and thus loved the technical aspects of the book. Although at times it seemed a little dry and slow-moving, the pace would pick up and the powerful sense of urgency and pressure would return.
The British listened in on everybody's transmissions, including allies, and it was all crucial to the war effort. In a way, this book is very timely, having been published only a couple of years ahead of the revelations about the activities of the NSA, which are really not much different from those of Bletchley Park.