Norris is an englishman who has spent over 40 years in the aerospace industry and time on the U.S. Apollo program. Here he reviews the history and technology of spy satellites. Readers will find a good, fairly clear review of the topic based on secondary, unclassified resources. The first half of the book is heavily historical while the second half devotes more space to strategy and analysis. Easily understandable for undergrads and high schoolers, it reads like an extended article from Aviation Week and Space Technology. English origins are obvious but he succeeds in covering all the international players (U.S., Britain, France, Russia, China, India, etc.) and that is a strength of the work. A little bit repetitive and at least one footnote is not supported. (He cites Rhodes but there is no Rhodes in the biblography. No doubt he meant Richard Rhodes). Still, all-in-all a good overview of a topic where there isn't much available. High school, college and medium-sized or larger public libraries will find this a good purchase.