The town of Wyse, set precisely on the border of England and Wales, is remarkable for one thing: it is the only remaining human town where magic works.

When twelve-year-old Ava and her brother return to their birthplace of Wyse, they discovers that their once magical town has been losing its charms under the control of Lord Skinner. Uncovering a working magic mirror, Ava opens an unauthorized link to the twinned town of Unwyse, where she meets Howell, one of the unlucky Fair Folk who is being pursued by the terrifying Mr Bones.

Discovering that they are the joint guardians of a grumpy old book that can tell the future, the new friends are unexpectedly launched headlong into an adventure to uncover the mysterious link between Mr Bones and Lord Skinner, and to find out what’s happening to the waning magic that connects their two worlds.