Stephen Brice, a young lawyer in Civil War-era St. Louis, falls in love with Virginia Carvel, the daughter of his benefactor. But she is loyal to the South and Brice is committed to Lincoln's cause. In the course of the war, their convictions separate them, and Virginia becomes engaged to her cousin Clarence Colfax, a Confederate officer. Brice becomes an officer under General Sherman, and eventually finds himself faced with the captured Colfax, facing execution for spying. Brice must decide whether or not to intercede in his rival's behalf.