"Ultima Thule" is the last part of the trilogy "The Fortunes of Richard Mahony" by Australian writer Ethel Florence Lindesay Richardson under her pen name, Henry Handel Richardson. The novel tells about the life of Dr. Richard Townshend-Mahony from Edinburg, who went to Australia for a better life. In the last book, the author tells about the decay of Mahony's personality and the influence of Australia on his life.