When George stays with Aunt Primrose, certain doubts start to creep into his mind. Has she really got exploding hair? What is she keeping in the cellar?
Gradually he begins to realize that Primrose has been kidnapped and in her place is her evil sister: Violet the sea hag. Can George rescue Primrose and outwit Violet? And how will he deal with the astonishing family secret that is finally revealed to him?