Still recovering from his last case, Walt Longmire just can't find the opportunity to sit back and kick off his cowboy boots. The pride and joy of Tommy Jefferson's stables, the notorious divorce horse, has gone missing, and Jefferson, renowned Indian Relay Racer and one-time meth head, wants him back. With the help of his best friend Henry Standing Bear and his daughter, The Greatest Legal Mind Of Our Time, Walt sets off to the races.