Out of Breath dreams of a powerful white animal that runs unseen through the desert as quickly and easily as water runs through his fingers. His people tell him that visions are suspect. But he leaves to search the desert himself, and returns leading a beast no one has ever seen before, a tall, bony creature who says its name is Horse. The people of Red Earth City are afraid of it -- all except the beautiful, willful Wants the Moon, who first thinks of riding on its back. Together, Out of Breath and Wants the Moon will prove what Horse means to their people and to the Buffalo Hunters of the Grass.