Brother and sister James and Mandy are spending a winter weekend at a cabin with their lively German shepherd, Rosco. Rosco has never experienced snow before and now he will get the chance to romp around in it, high in the mountains. The kids will build snowmen and brave a steep sledding hill. But will a mysterious visitor bring trouble? And will Rosco’s curious nature spoil the weekend for the kids, or will it save the day? Find out in this heartwarming, wintry, family adventure.