"It's a question of what you have to do, what you have to live with if you don't." Sheriff Walt Longmire is reading A Christmas Carol in his office on December 24th when he's interrupted by the ghost of Christmas past: a young woman with a hairline scar across her forehead and more than a few questions about Walt's predecessor, Lucian Connally. Walt doesn't recognize the mystery woman, but she seems to know him and claims to have something she must return to Connally. With his daughter, Cady, and his undersheriff Vic Moretti in Philadelphia for the holidays, Walt is at loose ends, and despite the woman's reticence to reveal her identity, he agrees to help her.