Kirstie and Lucky chase after a beautiful Appaloosa that seems to be lost. Each time Kirstie seems to get close to catching the Appie, which she has named Navaho Joe, he slips away. With a winter blizzard threatening to hit any moment, Joe seems doomed to have to survive the stinging cold by himself. Suddenly, two men turns up to collect Joe in answer to the 'Lost' sign that Lisa put up in her mom's diner. Kirstie doesn't trust them, and neither, it seems, does Joe...