Uncover the hidden world of espionage during the American Civil War in On Secret Service by William Nelson Taft. This gripping historical novel plunges you into the shadows of battlefield intelligence, covert missions, and daring spycraft on both sides of the conflict. As Union and Confederate agents race to outmaneuver each other, listeners are treated to a fast-paced tale of danger, deception, and patriotism. Perfect for fans of military history, espionage fiction, and Civil War storytelling, this audiobook captures the spirit of bravery and betrayal in a nation divided.