The seventh title in the hugely successful Zoe series. "It is the Annual Fairy convention, and I'll be away for a few days," announced the Fairy Queen one morning. "There must be no trouble here at Fairy School." All the fairies promise to be on their best behaviour, and everything goes well until Marcy hits her head.

When the Fairy Nurse mistakenly gives her growing medicine instead of pain medicine, Zoe and Pip have to find out about a shrinking medicine.

To their horror they discover the ingredients are at the top of a mountain guarded by a scary troll...