Avery Buckle has always been different: part girl, part cat and entirely confused about where she really belongs. But it turns out her tail isn't her biggest secret ... Plunged into an extraordinary world of witches, enchanted libraries and fantastical creatures, Avery discovers only she can stop a dark force from being unleashed. But with a powerful enemy on her tail, can Avery save the magical world and find out who she really is?