'In this adventure, Runcible and Mariam are in even worse trouble, for Lord Shambles has returned, stronger than ever. Once he finds the lost Citadel of Magic there will be no defence against his dreadful sorcery - and with it he plans to take over the world of Iltior, then drive Earth back to the Dark Ages.
'To stop Shambles, the children must defy his Night Stalkers, journey back to wondrous Iltior and descend to the uttermost pole. But even if they find the Codex of Dreadful Spells, Runcible still has to unravel the mystery of the tainted children then face his most terrifying nightmare - the sting of the giant scorpion.' (Publication summary)