Jimmy, Gerald, and Cathy hope to find adventure when they set off to explore the woods, but they get far more than they bargained for when they discover the Enchanted Castle. At first, they seem to be in a fairy tale come true, until a friend turns invisible, thanks to a magic ring she can't remove. Adventure follows adventure as they seek to control the magic—but the magic has a will of its own, and it is all they can do to keep up. Faced with sleeping princesses, magic rings, and moonlit gardens filled with magic, the children must use all their courage and ingenuity to control the magic and solve the mystery surrounding the Enchanted Castle.