Left behind in a cold and dark burrow, a baby rabbit named Tumkit is destined to die of starvation until Vella, a shrewd and fearless mockingbird, discovers Tumkit and brings him a magic berry. The berry comes from a solitary bush that grows in a cave near the top of Laurel Mountain. Vella warns Tumkit the bush is struggling to survive, and unless they act quickly the supernatural powers of its berries will be lost forever. Tumkit, Vella, and Sully, a one-year-old buck and loyal friend to Vella, travel up the steep mountain in a desperate attempt to save the bush. Their quest takes a dangerous turn when they encounter Borwong, and angry and heartless grizzly bear who refuses to allow anyone on his mountain.