Like Jamie McShane before him, Galway Storm, a beautiful black stallion, emigrates from Ireland to Beaver Island, Michigan. Jamie is enraptured by the sight of the sleek animal who seems to understand his Gaelic whispering. But Storm belongs to Colonel Stone and his daughter Susan. Nevertheless it is Jamie who finds the stallion when he runs off to mate and Jamie who helps the animal escape after Susan is thrown from his back. Isolated on High Island, the boy and his horse prove their affection for each other -- Storm by swimming out to rescue Jamie from a capsized boat and Jamie by maintaining a hiding place. Unfortunately, the fantasy of living the hermit's life forever is shattered by the arrival of a rescue party headed by Colonel Stone and Susan. Having recognized Jamie's skill with horses and attachment to Storm, the Colonel makes him Storm's groom and also purchases the mare and foal to insure the horse's happiness as well. Horse lovers will find this a satisfying addition to their files, despite certain far-fetched elements in the plot.