Imagine Ellen's surprise when Princess Mirror-Belle climbs out of the bathroom mirror! She comes from a world where bubble fish swim in the bath, elves sleep in slippers, and brave knights fight fire-breathing dragons. And while Ellen has chicken pox, Mirror-Belle has dragon pox — but she knows just the cure. The bath is soon overflowing with bubbles and goo... but will it get rid of their spots? Based on the original PRINCESS MIRROR-BELLE story for older readers, this is the seventh glittery adventure from Julia Donaldson and Lydia Monks, the award-winning creators of WHAT THE LADYBIRD HEARD and THE SINGING MERMAID.