Living in a tar-papered shack on the lush green slopes of Noah's Mountain, nine-year old Lindy Cooper uses powerful imagination to mask rejection and poverty while her imaginary friend and protector, Princess Twilight, thrives inside a fantastic complex of caverns this lonely child creates beneath the mountain. Together they must not only find seven keys of wisdom, create magic orbs to vanquish "Dragon" from Ebony Cave, but also find a way to break the curse imprisoning an enchanted unicorn.