The Private Memoirs, first published in 1824, is an early psychological novel, in which the phenomena of the split personality and the obsessed character are described with extraordinary insight. Set in the gloomy world of 18th-century Scottish Calvinism, the novel is a story of moral fanaticism, of a mind darkened by and overpowering conviction of its own righteousness. The story concerns two brothers: one murders the other and is in turn destroyed - or destroys himself. It is a book, Andre Gide wrote, "fitted to arouse passionate interest both in those who are attracted by...