What drives a person to risk their life by entering the deadly world of high-level espionage? A unique investigation of the most important cases of the twentieth century, this exploration of the world's most glamorous and dangerous job – including information newly released under the Freedom of Information Act – will keep you enthralled until the last page. Neil Root's insightful book focuses on the personalities of many enigmatic figures, discusses their motivations and influences, and asks whether they were heroes, traitors or just scapegoats.