Janet Wyman Coleman gives readers just enough information about topics to make you want to search online or check out books that have a more in-depth view. This is definitely a survey of spying technology, strategies, and conspiracies, rather than an involved study of spying in any one era. Coleman includes tidbits from ancient times through the present. This book has been a popular choice in my classroom - it is easy to thumb through, with lots of photographs and text boxes that make for quick reading.