Pratchett's first two adult novels, The Dark Side of the Sun (1976) and Strata (1981), were both science-fiction, the latter taking place partly on a disc-shaped world.
Pratchetts to første bøger for voksne, henholdsvis The Dark Side of the Sun fra 1976 og Strata fra 1981, var begge science fiction; den sidste finder sted på en delvist disk-formet verden.