"With a single shot from a pistol small enough to conceal in his hand, John Wilkes Booth catapulted into history on the night of April 14, 1865. The assassination of President Abraham Lincoln stunned a nation that was just emerging from the chaos and calamity of the Civil War, and the president's untimely death altered the trajectory of postwar history. But to those who knew Booth, the event was even more shocking--for no one could have imagined that...