As the Civil War ground on, an underground Unionist movement flourished in the heart of the Confederacy, led by an unlikely leader. Elizabeth Van Lew, a wealthy and well connected member of Richmond's elite, risked everything to help save the Union, skillfully directing this clandestine group and becoming General Ulysses S. Grant's spy in Richmond. Surrounded by a cadre of "slaves" secretly freed and working with her at the risk of their lives--and...