Emma nurses a wounded friend; Dr. Foster wrestles with his marriage and career; Mary strives to improve the lives of her patients with help from Samuel; and Silas involves Aurelia in a corrupt deal.

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.