If there is still such a thing as GOFSF (good old-fashioned science fiction), Entanglement very much fits that category. Our central characters are the classic space travel misfits, on a survey vessel in the Asteroid Belt, hence the series title (this is very much a series book). Our hapless heroes get the opportunity to get the finders' fee on a missing piece of tech in a derelict ship. Briefly they're very happy - until they find out every government and dodgy corporation wants to get their hands on this technology, and will stop at nothing to do so. It all plays out nicely, with two set piece adventures. To be honest, Gerald Kilby's ideas are better than his writing style - but that wasn't a problem for Asimov, so it's not really a criticism. The writing is workmanlike, but rarely page turning, while the characters, if not two-dimensional are on the thin side. At least, unlike Asimov, he has significant female characters. What makes it GOFSF is the solid use of ...
There are a few SF titles that have cut through to be regarded modernish classics in the more general literature sense. One example would be Flowers for Algernon (which I read in English class at school). Another, surely, is the 1959 A Canticle for Leibowicz . There are parallels with Pavane , in presenting a 'modern day' setting with medieval living standards where the Catholic Church remains a major power, yet technology is gradually breaking through. But this is not an alternative history: it's a post-apocalyptic future where civilisation was destroyed by nuclear war, with tiny embers of knowledge kept alive by a monastery dedicated to a twentieth century electrical engineer turned priest called Leibowitz. Divided into three sections, each taking place six centuries apart, we first get a totally medieval view of the discovery of circuitry on a blueprint and more from pre-apocalyptic times. Then we see the gradual re-emergence of electrical technology in the abbey. And ...