Spies — Audiobooks
German Spies in England: An Exposure
by William Le Queux
Spies and Secret Service The story of espionage, its main systems and chief exponents
by Hamil Grant
Britain's Deadly Peril: Are We Told the Truth?
by William Le Queux
The World's Greatest Military Spies and Secret Service Agents
by George Barton
The German Spy System from Within
by Anonymous