John and Madison Carmichael's success in their careers has come at a high price at home: they are on the brink of divorce. To soften the blow for their two children, they decide to spend one final Christmas together as a family. Responding to a travel brochure, they set off to "Celebrate Christmas Past" in the Smoky Mountains of Tennessee with a group of historical re-enactors. Tensions worsen when their car breaks down, but a horse-drawn carriage...