Every year, Alison's family goes to Chincoteague Island to see the wild pony auction. But this year is different: Alison has saved $550, and her parents say that if she and her sister Laura can find a pony for that price, they can spend the money. But with ponies being sold at $1,000 or more, it looks hopeless--until two strangers enter the auction, and the girls realize they may be the recipients of a priceless gift.