Dot, Lily, and Bess love riding together at Starbright Stables. One day, Lily learns Dot is moving—but nobody has told Dot yet! Soon a new pony arrives, and Dot gets attached to it. Lily worries Dot will be heartbroken when she has to leave the pony behind. She tries to keep Dot from spending time with it. Then Lily goes too far and makes a big mistake. Can she save her friendship with Dot before it’s too late?