Undercover operations are valuable ways for law enforcement agencies to gain information and investigate crimes from inside the worlds criminals inhabit. These operations can be dangerous, and readers learn about the risks inherent in this line of work as they explore the fascinating history of undercover operations. Enlightening sidebars, informative fact boxes, and detailed photographs provide readers with additional information, including tips for preparing for a career that could involve undercover work. Readers are also introduced to fascinating facts about the technology used in undercover operations and how that technology has changed over time.