"Discusses different methods of secret communications used by spies, such as Morse code, the Enigma machine, the Najavo language, and digital steganography, and includes career information"--
"Discusses double agents and traitors throughout history, such as Benedict Arnold, Dusan Popov, Kim Philby, and Robert Hanssen, and includes information on becoming a spy catcher (counterintelligence agent)"--
"Discusses different technologies used by spies, such as satellites, lasers, robots, drones, and computer software, and includes career information"--Provided by publisher.