Our adventure begins with Musa discovering a book filled with ancient sheet music and when she plays the songs inside of it, she is transported to a different world. It is there that she meets the cursed King Nobody and finds herself heartbroken. When she returns with the rest of the Winx to help lift the curse, they realize the task is more dangerous than expected. The Winx then decide to spend their summer vacation on Earth where they discover the haunted Castle of Balmoral, only to get tangled up in its mystery. The Winx are then plagued with personal nightmares and are met by an injured girl from the forest. After learning that she is trapped within her own nightmares, the Winx search for a way to free their new friend.