This set is a comprehensive guide to the history, uses, related scientific principles and technology of espionage and intelligence. The Encyclopedia includes approximately 800 entries, written by experts in the field, ranging in length from 300 to 2,500 words. Topics covered range from the historical use of espionage to the emerging use of technology in modern espionage and counterintelligence. Additional features include more than 300 photographs and illustrations; a chronology, glossary and bibliography; and a comprehensive subject index.