For the fairies of Pixie Hollow, the Winter Woods are strictly off limits. But when a mysterious force draws Tinker Bell to cross the border into this unknown world, she discovers a secret that will change her life forever. She comes face-to-face with a frost fairy named Periwinkle, the only fairy who can help unlock the secret of the wings. With fun and laughter, they form a magical connection and make an astonishing discovery...they’re more than friends, they’re sisters! When Pixie Hollow is threatened, this perfect pair must work together to save their two worlds.