Follows the life of the wild stallion who was taken from Mexico's Sierra Madre mountains to become one of the sires of the Pony of the Americas breed in the United States.
In 1860, eleven-year-old Annie, who lives at the Red Buttes Pony Express station in the Nebraska Territory, asks Pony Express rider Billy Cody to help her find the person responsible for sabotaging her favorite pony Magpie.
In 1908 thirteen-year-old Dixie's new life on the Oklahoma frontier is complicated by a war of nerves between her and John Three, a young Kiowa Indian who insists that his pony was sold to her without his permission.
Paul and Maureen have worked to scrape together money to buy the wild pony of their dreams. But just as the Phantom and her newborn colt are within reach, bad luck seems to shatter their hopes.
Emma is dubious about moving to the country until she meets Sheltie, a very clever Shetland pony who solves the mystery of who is stealing a neighbor's cabbages.