When Rupert and his friend Amelia find the new substitute teacher doing odd things, they discover that she is actually a witch with a magical talking cat who sought them out in order to stop an evil coven of witches from destroying her.

One dark and stormy night, Rupert is called on by a mysterious stranger who gives him a ship in a bottle...with a tiny living man onboard! He frees the man, who turns out to be the evil warlock, Mordo, who kidnaps Amelia and takes her back in time to 1640. Rupert calls on Miss Switch for help in this new adventure.