Three bat fairies have been abducted. Luna and her friends embark on a rescue mission that leads them into the Well of Secrets, which is the doorway to Eventide, the Land of Darkness. In an attempt to free the captives, the fairies uncover the secrets of a magic mirror and a grand piano. They also encounter a Light Witch who has trapped a Dark Witch inside the mirror. With the help of an elf owl and a sphilox, an elf fairy of light, Luna battles an evil agent of the Demon of Darkness to free the fairies and escape from Eventide.