Lewis's themes mostly centre on her profound Christianity and the rewards of virtue. Her work is self-conscious and shows great erudition. Some works (Essays on the Art of being Happy, 1803, A Tale without a Title: Give it what you Please, 1804, The Nuns of the Desert, or, The Woodland Witches, 1805, and the four-volume The Discarded Daughter, 1810) were published under the pseudonym "Eugenia de Acton".[2] Her plots have been described as "overcrowded and creaky", but with "a strain of creative unconventionality".[3]