War threatens Salsabil's family. Drought and raiders may take all they have, and though Salsabil's brothers are ready to fight, none of them know what they're getting into. She's only a girl, raised in the sands of the Arabian desert; what can she do to help? But she has seen a wild horse in the dunes, and though her people think her mad, she feels the beginning of hope: for there is a horn on the horse's forehead . . .