This is the sequel to Protheroe's Yard. Kate and Jack set off to rescue Kate's nephew  who has been stolen by Witch Evilyn  a changeling has been left in his place. They travel to the lands of the four elements and meet the various characters that rule each land, The Water Lord, the Earth lord and the Four Winds.

    They have many adventures until they reach the court of the Green King who will decide the fate of Kate's nephew.