Four amazing princesses. Four magic jewels. A series glittering with friendship and adventure! 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. Sabrina the Sapphire Princess rules the beautiful Blue Lake. Her palace floats on top of the water like a magical lily pad. But does something dangerous lurk beneath the peaceful lake? Sabrina is determined to keep her people safe - even if she has to come face-to-face with a monster! A full sheet of holographic stickers in every book!