'Charming, alarming, violent and strange, a cross between Treasure Island, The Railway Children and Deliverance' Turnstone is the fourth volume of 'The Greatest Cape' series of novels, and follows on from The Black Joke, The Bernadette and Rio Sagrado, continuing the saga of the Potts and Prettyfoot families. Pert and Rosella may have grown up and become respectable, but June...