The book of the English journalist E. H. Cookridge is devoted to the history of the struggle of the English counterintelligence against Nazi espionage during the Second World War. Extensive factual and documentary material was used. The struggle of British counterintelligence against German spies in England, Hitler's intelligence activities in the Middle East, South America and Africa. Hitler's espionage system, methods of training agents and sending them to various countries. The secret terrorist organization Feme, which Nazi leaders used to eliminate their political opponents in Germany itself and beyond. The book is written in a lively and entertaining form. For a wide range of readers.