Movie men have come to Chincoteague to film the annual pony penning, and Paul and Maureen are thrilled - until they learn that the producers want to buy their beloved Misty. Reluctatnly, they agree to sell her in order to send their uncle to college. But how will they ever fill the lonely places that Misty leaves behind. 

Finding an orphaned foal helps Paul and Maureen deal with their loss, and they soon discourage that little Sea Star needs them just as much as they need her.