Fantasy author Terry Pratchett is famous for his Discworld series, comprised of over forty books taking place on a round, flat world perched on the back of four giant elephants who stand on the shell of a enormous space-faring sea turtle.

But before fantasy-trope-skewering Discworld, Pratchett wrote Strata, a science fiction book that explored the idea of how a flat, round world would actually work. Many of the ideas in Strata appear in the Discworld books.

While Strata isn’t quite as good as most of the Discworld novels, it’s still a fun, funny romp as a 210-year-old woman and her two alien friends come across a flat world populated by humans and what appear to be various demons.

Recommendation: If you’re a Discworld fan, please read this book. You’ll get a kick out of it. Check it out at the library. But if you haven’t started Discworld yet, I strongly recommend getting started with the third book, Equal Rites.