Samuel Elkins, fighting for the South in the American Civil War, has been fatally wounded by fellow soldier Lucius Casler, who has taken a photo of Elkins' wife Charlotte and, along with several other deserters, has headed for the Elkins home. As Elkins lies dying on the battlefield, the Doctor comforts him, and promises to keep Charlotte safe. The Doctor allows Samuel and Charlotte to spend Christmas together before he has to return Samuel to the battlefield.