Willow and her witch friends are quite surprised when they find a treasure map that Aunt Alwina has hidden for them. What initially feels like a game soon turns serious. Even Grimmoor, their usually talkative witch book, doesn't want to help the friends. When a mysterious boy with a violin appears and a peculiar forest spirit awakens, the girls realize that something is amiss. Suddenly, everyone seems to be after this treasure - even an ancient wizard finds his way into Willow's forest. But who can Willow trust? The young witches gradually become aware that this must be one of the most valuable treasures in the world. But will they manage to be the first to uncover the secret?.