'They lived in a kind of hieroglyphic world, where the real thing was never said or done or even thought, but only represented by a set of arbitrary signs.'Edith Wharton's most famous novel, written immediately after the end of the First World War, is a brilliantly realized anatomy of New York society in the 1870s, the world in which she grew up, and from which she spent her life escaping. Newlan...