"The Secret Life of Spies" presents illustrated snapshot biographies of men and women who served as spies internationally throughout history. The biographies are short enough to read in just a few minutes, while maintaining the interest of the reader. They are written in a way that supports the development of reading skills. Upper elementary and middle school readers should find this non-fiction book interesting and appealing, as it is based on "real" people who conduct a mysterious and intriguing business, filled with secrets and secret activities and inventions.

The book begins with several pages of introduction that explain the concept of espionage and the basis for these activities. Colorful drawings accompany each biography, showing the person at work. Side boxes with bullet points explain specific terms related to espionage. A glossary at the end of the book also defines the terms.

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