Prepare to go undercover and enter a world of secret missions, covert operations and classified information.Explore the history of espionage from ancient secret agents to modern-day surveillance, and read about the lives of infamous spies and their missions.Learn the language of spies and how to read codes and ciphers, then ask yourself the all-important question - could you be a spy?An exploration of a hugely popular subject by the author of the best-selling 'Horrible Geography series.