The book is ten years old. Since it was published, there have been much more detailed works on satellite imagery and the new stealth aircraft. Whatever this contains on overhead reconnaissance sattellites was based on guess and informed speculation. As far as the knowledge of the Corona (see books) KH-4 program of the sixties, all has now been revealed in three major books and in numerous news accounts of the operations of the once black National Reconnaissance Office.

I bought this book via amazon.com without knowing anything about it. The back dust jacket on the book says it was written for teen-agers. This means that this 140 page book lacks the details that a 600 page book would have, but it still has plenty of amazing details. It's written at the level of a magazine article, so adults don't have to feel like they are reading a juvenile book. But I must say that the details are amazing. I'm surprised it's legal to say as much as the author said. I enjoyed this book. At 140 pages and without complex sentences, it was a quick and easy read. Yet I came away from this book with a lot of information that I never thought would be publically available. The topics are the U-2, the SR-71, and a series of spy satellites. I recommend it.