Subject
5 free books about spies, free to read online. Chapter 1 of any book is free, no account needed.
Spies and Secret Service The story of espionage, its main systems and chief exponents
Hamil Grant
The German Spy System from Within
Anonymous
The World's Greatest Military Spies and Secret Service Agents
George Barton
German Spies in England: An Exposure
William Le Queux
Britain's Deadly Peril: Are We Told the Truth?
