As the Confederacy felt itself slipping beneath the Union juggernaut in late 1864, the South launched a desperate counteroffensive to shatter the U.S. economy and force a standoff. Its secret weapon? A state-of-the-art raiding ship whose mission was to prowl the world's oceans and sink the U.S. merchant fleet. The raider's name was Shenandoah, and her executive officer was Conway Whittle, a twenty-four-year-old warrior who might have stepped from...