Once upon a... time there was a marvellous land of Snergs. Miss Watkyns, a teacher who loved children, lived there. Just over the river lived Golithos, a not so friendly giant, who also loved children – with a lot of salt! He had a friend called Mother Meldrum, the wickedest witch that ever lived. When Sylvia and Joe run away for a big adventure their lives are in deadly peril when they fall into the clutches of these two evil characters.