Veteran journalist Douglas Waller turns his sights on the shadow war of four secret agents for the North, three men and one woman. From the tense days before Abraham Lincoln's inauguration in 1861 to the surrender at Appomattox four years later, Waller delivers a fast-paced narrative of the heroes, and scoundrels, who informed Lincoln's generals on the enemy positions for crucial battles and busted up clandestine Rebel networks.

1861. Allan Pinkerton -- George Sharpe -- Elizabeth Van Lew -- Lafayette Baker -- Secret Service -- Bull Run -- The Ohio Department -- Washington -- "Enemies of the state" -- 1862. Richmond -- "I have the honor to report" -- The Peninsula Campaign -- Second Bull Run -- Antietam -- Fredericksburg -- 1863. "The great game" -- Chancellorsville -- Gettysburg -- 1864. Muckraker -- The Richmond ring -- Ulysses S. Grant -- The Richmond-Petersburg Campaign -- 1865. Richmond's fall -- Assassination -- Peace.