Spirit of Steamboat by Craig Johnson

Disappointed, she whispers "Steamboat" and begins a story that takes them all back to Christmas Eve 1988, when three people died in a terrible crash and a young girl had the slimmest chance of survival. At the Durant Home for Assisted Living Lucian Connally is several tumblers into his Pappy Van Winkle's and swears he's never clapped eyes on the woman before.

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. Walt doesn't recognize the mystery woman, but she seems to know him and claims to have something she must return to Connally. "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.