United States — History -- Civil War, 1861-1865 -- Secret service — Audiobooks

The Spy of the Rebellion Being a True History of the Spy System of the United States Army during the Late Rebellion
by Allan Pinkerton

Nurse and Spy in the Union Army The Adventures and Experiences of a Woman in Hospitals, Camps, and Battle-Fields
by S. Emma E. (Sarah Emma Evelyn) Edmonds
