This capacious anthology charts espionage as lived experience, historical record, and popular legend. Its twenty memoirs and biographical sketches move across military intelligence, clandestine travel, counterespionage, disguise, interrogation, and political intrigue, combining firsthand testimony with Victorian and early modern biographical narration. Civil War adventures, accounts of revolutionary loyalties, and reflections on the professionalization of secret service emerge as especially compelling strands. The collection's varied registers-confessional, documentary, sensational, patriotic, and analytical-show how the spy's "double life" unsettles the boundary between public history and private identity. The contributors include soldiers, journalists, historians, intelligence professionals, travel writers, and literary figures whose perspectives were shaped by nineteenth- and early-twentieth-century imperial, national, and military cultures. Their writings participate in the development of modern espionage literature, while also preserving competing ideals of duty, deception, gender, empire, and heroism. Read together, these voices reveal how biography and memoir transformed covert action into a subject of both historical inquiry and popular fascination. Recommended for students of military history, intelligence studies, biography, and adventure writing, this volume offers an unusually broad encounter with espionage's human dimensions. It invites readers to compare styles and assumptions across eras, and to trace the productive dialogue between testimony, legend, and historical interpretation.