Four girls are about to become princesses! But can they keep their kingdom safe? In the Jewel Kingdom, four girls rule: Roxanne is the Ruby Princess, Sabrina is the Sapphire Princess, Emily is the Emerald Princess, and Demetra is the Diamond Princess.But soon-to-be Ruby Princess, Roxanne, is not so sure she's ready to be royalty. She decides to run away! But before she can get very far, she learns of a plot to take over the Jewel Kingdom. Another girl is pretending to be her. If Roxanne doesn't act fast, the Jewel Kingdom might be lost forever!