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