John Brown asks Harriet Tubman to fight with him to stop slavery. Her traumatic epilepsy triggered, Tubman moves through time to a modern Philadelphia prison. She meets Nelson Davis, who falls in love with her. He detains her from Harper’s Ferry; Furious, she returns to her time to mourn the failed raid. But when she’s recruited to lead the Union Army’s Combahee River Raid, she returns to the prison to recruit her spies. Davis goes back in time separately to fight Confederates and TB—and become her second husband.