The complete story of spying in a highly illustrated fun flap book. Find out what spies actually do, where they work, what gadgets they use, what tricks they learn to keep secrets safe, and even find out how people become spies and what they learn at spy school. Learn up-to-the-minute tricks about how people make and hide codes in all sorts of ways, from simple ciphers to high-tech computer tricks, and even using bacteria. Watch field agents in action, hunting down enemy spies, finding secrets, and helping people escape from danger. Following Usborne's long tradition of insider spy knowledge, this book was made with input from real spies.