Written in 1959, A Canticle for Leibowitz is one of the first real literary science fiction books, and an enduring, if not exceptionally well-known, classic.
The story takes places several hundred years after a nuclear apocalypse, and civilization barely exists. It’s a leisurely read that thoughtfully deals with the aftermath of a post-apocalyptic world through the lens of the denizens of a monastery in the Utah desert.
In this monastery are bits of scientific knowledge that the monks do not understand, and keep to themselves amid their trials and squabbling.
As the story occasionally skips forward in time hundreds of years, you don’t get to really settle in a consistent group of characters, but you do experience their civilization advancing.
Interestingly, during World War II, author Miller was a tail gunner in a bomber crew that participated in the destruction of the 6th-century Christian monastery at Monte Cassino, Italy, founded by St. Benedict, and recognized as the oldest surviving Christian church in the Western world. It’s generally assumed that this experience heavily influenced his writing this story.
Recommendation: Read it, if you’re in an old-school cruising mode. If you’re after something modern or space-opera-y, keep looking.