Separated from Browns army, Onion and fellow slave Bob leave the fight in Kansas only to cross paths with pro-slavery red shirts who escort them to the slave-trading town of Pikesville, Missouri.Onion is taken under the wing of Pie, a mixed-race prostitute working out of the local hotel, who instructs him in the ways of the world despite her discovering his dangerous secret. Onion soon finds himself enmeshed in a mounting slave insurrection where he learns the consequences of his own actions.