This entry was published at least two years ago (originally posted on March 5, 2019). Since that time the information may have become outdated or my beliefs may have changed (in general, assume a more open and liberal current viewpoint). A fuller disclaimer is available.
Book twenty-one of 2019: Second Foundation, by Isaac Asimov. ⭐️⭐️⭐️⭐️ 📚
Asimov himself notes this in an introductory essay, but his ability to craft engaging SF of ideas and conversations over three books (eight stories) with little to no “on stage” action is remarkable.