Riddley Walker: AND The Medusa Frequency

Blurb

Riddley Walker is a science fiction novel by Russell Hoban, first published in 1980. It won the John W. Campbell Memorial Award for best science fiction novel in 1982, as well as an Australian Science Fiction Achievement Award in 1983. It was additionally nominated for the Nebula Award for Best Novel in 1981.
Hoban began writing the novel in 1974, inspired by the medieval wall painting of the legend of Saint Eustace at Canterbury Cathedral. It is Hoban's best-known adult novel and a drastic departure from his other work, although he continued to explore some of the same themes in other settings.