I have been a lover of mystery books and intelligence gathering almost since I learned to read. As both a literature buff and history buff, delving into the evolution of intelligence gathering (coupled with the ever-expanding technology) became almost a "must". The book is well balanced, delving into the different modalities and technology used in intelligence gathering coding, decoding, and transmission. It also features brief vignettes on particular spies who were superlative in their vocation as well as some who were not so spectacular, and some who just had amusing (or irritating) idiosynchracies that gave a smile now and then.
It is, first and last, a HISTORY book -- and anyone who reads much history knows that it is very densely packed, and very slow reading. However the information one gleans about how technological advances which are not only applied to "improvement in living ease" but also in ever-more-difficult spying techniques will long be remembered.
Taking the transmission of intelligence from private courier to telephone, to "Marconi wireless" to various kinds of wireless technology and "bugs" all had both strong and weak points which needed to be addressed.
I gave it 4-stars because the reading is so dense and moves so slowly, and in order to follow one chain of events, other developments not used in this primary endeavor must be backtracked and introduced at a later time, so it does not lend itself to a strict chronlogy, but you find you are taking mini-backtracks exploring other methods as well.
All in all, it is a very good book, but a book to be read a little bit at a time, so that there is time to "digest" it. Three Cheers to Jeffrey Richelson, who had the patience to untangle it, and present a masterful book!!







