World of the Mad

World of the Mad is a science fiction novel by Poul Anderson, likely written in the early 1950s. The story follows Langdon, who has achieved immortality on the alien planet Tanith, as he struggles to protect his wife, Eileen, from the psychological turmoil caused by their extraordinary surroundings. The narrative explores themes of love, fear, and the alien nature of reality, raising profound questions about the implications of immortality and the fragility of sanity.