It is 1915, and Sam Ferrier and his father arrive by train in Curlew, Alberta, to build a new home for the family. When they finally reach their parcel of land, Sam can see nothing but endless stretches of grassland and blue sky. It is nothing like their old home in Iowa, and he wonders why his restless father ever decided to bring the family to this lonely, barren land. In time, though, the house is built, and the rest of the family joins them. Gradually Sam discovers that there is much more to the flat and featureless prairie than he realized -- gleaming white skulls, torrential thunderstorms and, best of all, a new friend and a brave, resourceful horse named Prince.