A major addition to the history of the Civil War, Lincoln's Spies is a riveting account of the secret battles waged by Union agents to save a nation. Filled with espionage, sabotage, and intrigue, it is also a striking portrait of a shrewd president who valued what his operatives uncovered. Veteran journalist Douglas Waller, who has written ground-breaking intelligence histories, turns his sights on the shadow war of four secret...