"The Long Road" (1926) contained his best-known poem, "The Flying Fish", an allegory which had first appeared in "The Dial" in 1896. Gray produced one novel, "Park: A Fantastic Story" (1932), a surreal futuristic allegory about Fr Mungo Park, a priest who, in a dream, wakes up in a Britain which has become a post-industrial paradise inhabited by black people who are all Catholics, with the degenerate descendants of the white population living below ground like rats. The novel is characterised by a vein of dry humour, as when a Dominican prior wonders if Park could have met Aquinas.