Following the battle in Pikesville, John Brown, now one of the most wanted men in America, travels north with Onion to raise funds for the abolitionist cause. They take refuge at the home of famed orator and "King of the Negroes" Frederick Douglass and his two wives. When Brown and Douglass clash over methodology, Onion discovers just how complex the fight for justice and human equality really is.

Onion and new recruit John Cook head to Harper's Ferry to prepare for the arrival of John Brown and his army. However, Onion quickly struggles to perform his mission of recruiting more African-American soldiers from the area when Cook's reckless behavior threatens their exposure to suspicious neighbors. After several weeks of waiting, Brown, his army and his daughter Annie finally arrive—creating a new distraction for Onion: true love.