Four girls are about to become princesses But can they keep their kingdom safe? Read to find out-- and collect the full sheet of sparkly holographic stickers in every book 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.Some of Princess Demetra's subjects have become trapped inside a mountain. She must risk everything--including her crown--to rescue her subjects A full sheet of holographic stickers in every book