I really enjoyed this book, especially when I finally understood what it was. I had come to the book thinking it was a popular expose type book- and this is NOT that. This book is totally honest- it's a how-to- how to get a job doing this work for real. In this capacity I was so taken with it that I wanted both my kids to read it -in case they want to explore a career in counter intel - they both have the sorts of minds that enjoy such puzzlers- and are patriots. This is a career inquiry and development book- that just also happens to be fascinating for the amateur historian and spy fiction fan who might read it as well.
As the Author, a retired US Army Intel/CIA CI, writing in 1987, covered the topic from many angles, he used many WWI/WWII/Cold War examples from history, focused on the many angles to each case. His explanations are thorough and complete, never insulting to the reader, but also carry a professional distance that is satisfying. Where similar seeming cases are actually quite different in nuanced ways- Johnson takes the extra time. I found myself engrossed, entertained and much more educated on spycraft than when I picked this book out.
Because of Adult themes and very adult discussions of motivations, this is best for a junior reader over 12, even with zero violence. For the Gamer/Modeller/Military Enthusiast, a mixed bag- mainly on deep background. But if you Model/Game the Spy War itself during the Cold War, this is a fine intro to the history you need to read- but also a guide to how to game Spy/CounterSpy - either tactics and strategies or for formatting your overall game. Either way a very useful book for the Cold War Student/Reader/Gamer- and I hope a few readers in every generation are convinced to work in the field- and keep us all safe. A wonderful lens through which to view the Cold War- or our present axes.