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The Best Secret service Books

The Secrets Of The German War Office

Armgaard Karl Graves

Nurse And Spy In The Union Army

S. Emma E. (Sarah Emma Evelyn) Edmonds

Twenty-Five Years In The Secret Service

Henri Le Caron

Secret Armies

John L. (John Louis) Spivak

Fighting Germany's Spies

French Strother

Secret Service Under Pitt

William J. (William John) Fitz-Patrick

My Secret Service: Vienna, Sophia, Constantinople, Nish, Belgrade, Asia Minor, Etc

Man who dined with the Kaiser

British Secret Service During The Great War

Nicholas Everitt

The German Secret Service In America

John Price Jones

Spies And Secret Service

Hamil Grant

The German Secret Service In America 1914-1918

Paul M. (Paul Merrick) Hollister

On Secret Service

William Nelson Taft