The War is over and a long-awaited engagement is on, but all is not tranquil at Downton Abbey as wrenching social changes, romantic intrigues, and personal crises grip the majestic English country estate for a third thrilling season. In the wake of World War I, Robert, Earl of Grantham, sticks to his duty to maintain Downton more firmly than ever.

Alexandria, Virginia, 1862. The lives of two volunteer nurses on opposing sides of the Civil War--Mary Phinney, a staunch New England abolitionist, and Emma Green, a native Confederate belle--collide at Mansion House, the Green family's luxury hotel that has been transformed into a Union Army hospital. Ruled under martial law, the border town in Alexandria is now the melting pot of the region, filled with soldiers, civilians, female volunteers, doctors,...