espionage

This book discusses different methods of secret communications used by spies, such as Morse code, the Enigma machine, the Navajo language, and digital steganography, as well as career information on espionage.

This book explores famous and infamous spies in history, including examples of female spies, child spies, family spy rings, and animal spies.

Describes the equipment and techniques of spies, the structure and functions of secret services, and notable spies in history.