When a nearly starved pony named Dusty is rescued by her mom, 13-year-old Anna vows to find those responsible and bring them to justice. According to her dad, Anna's heart has an overly developed justice muscle. Anna's friends Ginger, a whiz kid in Pony Club; and Felicity, an elite soccer player, pitch in to help solve the mystery. But when all clues lead back to the Gordon family, Anna is conflicted. Mrs. Gordon teaches the Pony Club lessons and Zane is a friend. How can they be mixed up in Dusty's past? Join Anna and her friends as they solve their first Animal Justice Club mystery.