Wharton combined her insider's view of America's privileged classes with a brilliant, natural wit to write humorous, incisive novels and short stories of social and psychological insight. Wharton's first full-length novel, The Valley of Decision, is set in eighteenth-century Italy. Here Wharton pits folks inspired by the antireligious thoughts of Rousseau and Voltaire against the orthodox leaders of the day. Soon enough Wharton's night-constant theme comes through: this, like most other violations of personal convention, will come at a terrible cost.