During a Union ball at their house, the Green girls and Frank initiate a daring plan to help Tom escape. Mary releases Dr. Foster, still shaky from his detox, from his "quarantine" so he can guide Samuel through a delicate operation.

President Lincoln's visit sets in motion a diabolical rebel plot and offers an opportunity to free James Sr. Dr. Foster uncovers a scheme to undermine him at the expense of his patients. Aurelia recovered from her surgery makes a bold decision.