On her first day at a new school, Mia is given a book and bracelet that are more than they appear. The items have the power to transport Mia to a magical storybook world, Centopia, where she becomes a flying elf who has the ability to talk to unicorns! Mia learns that unicorn horns have magical properties, and that the wicked queen wants to capture all of the unicorns for their power. Can Mia help keep the unicorns safe?