After Antietam, Foster and Samuel pay a visit to the Foster family plantation.

Lisette's intervention leads to a family reunion. Pinkerton's investigation causes a rift.

After the battle of Chantilly, Hopkins and Emma strike out to rescue wounded soldiers.

The Greens work together to hide an ugly secret; McBurney hopes to distance Foster from Mary by sending him on a house call to a nearby army camp; Alice helps Frank escape; and Samuel earns Charlotte's respect.

Foster cares for a gravely ill Mary, which doesn't sit well with the new chief; Charlotte tries to contain a smallpox epidemic; a house guest spurs a scheme by Alice; and Samuel faces a difficult decision.

In the wake of Lincoln's visit, the hospital staff tries to save one of their own.