 Caird was a member of the Theosophical Society from 1904 to 1909.Among her later writings is a large illustrated volume of travel essays, "Romantic Cities of Provence" (1906), and novels "The Stones of Sacrifice" (1915), which show harmful effects of self-sacrifice on women, and "The Great Wave" (1931), a work of social science fiction that attacks the racist policies of negative eugenics.Mona Caird died on 4 February 1932, in Hampstead, at the age of 77.