Off the windswept coasts of Virginia and Maryland lies a wild island, home to a centuries-old band of wild ponies. Among them is the Phantom, a mysterious and incredibly fast mare who has managed to escape every single roundup. No one has ever been able to catch her until a young brother and sister named Paul and Maureen set their sights on the beautiful horse. Determined to make the Phantom their very own, the siblings work tirelessly to earn enough money to buy her at the annual Pony Penning Day auction. But when Paul finally tracks down the elusive mare during the frenzied roundup, he makes a breathtaking discovery. Running right by the Phantom's side is a brand-new, silvery-gray foal named Misty! Now, Paul and Maureen must figure out how to care for a creature of the wild and her gentle, loyal colt. Can they truly tame the untamable Phantom, or will her heart always belong to the island? Discover the beloved classic tale of friendship, freedom, and the incredible bond between humans and horses.