"The Naked Sun" by Isaac Asimov
God forbid you search the name of this book on the Internet, lol. Anyway, another title by Isaac is down, and it is brilliant. In the late Foundation, there is less stuff about robot intelligence and a bit more towards the "humans."
The detective story is decent, too, especially the couple of plot twists in the end. However, it seems that the most interesting part of the book is how humanity advances towards the stars and the naked sun.
I enjoyed it!