The story of Molly Ferguson, unfolds during the secession storm and a civil war threatening to consume the nation. An enslaved prostitute, Molly is rescued by the Pinkerton Detective Agency and trained as a spy by the infamous Mrs. Kate Warne, America’s first female detective. After saving President-elect Lincoln from a failed assassination in Baltimore, Molly is sent into the Deep South—where the Civil War rages—a spy behind enemy lines.