Rupert Campbell is fascinated by the witches who live nearby. He dreams of broomstick tours and souvenir potions, but the closest he can get to a witchy experience is sitting in class with his awful teacher Mrs. Frabbleknacker. So when he sees an ad to become a witch's apprentice, Rupert simply can't resist applying. But Witchling Two needs all the help she can get to pass her exams and become a full fledged witch. She's determined to help Rupert stand up to the dreadful Mrs. Frabbleknacker too, but the witchling's magic will be as useful as a clump of seaweed unless Rupert can figure out a way to help her improve her spellcasting - and fast!