Book Description: Anna wishes she had never invited Rosalie and Mimi, the Junior Pony Pals, to join her friends on a trail ride. For one thing, Rosalie and Mimi have wandered off and gotten lost. And now one of their ponies has run away, too! It¹s up to the Pony Pals to save the day. But can they do it if it means going into a dark, scary cave?