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.