It's Halloween, and Josh and Maddy are all ready to go out trick-or-treating. But the arrival of their otter-people friends with an urgent message from Keeper the Giant changes everything.

Returning to the magical world, Josh and Maddy learn its inhabitants are not powerful enough to fix the increasing tears in the Veil. The magic that gives them strength is leaking away through the tears, and soon their lives will be at risk. A Gathering of the magical citizens decides Josh's power is the only thing that can save them – but how?

Josh, Maddy and Keeper learn they should approach the Weavers for help, and Josh and Maddy set off on a quest to find them. But the two face dangers on the way…and not everybody in the magical world wants them to succeed.