I'm finishing a Mary Renault book which I didn't totally love, but I've really enjoyed some of her others like The Last of the Wine and The Mask of Apollo. Very good, critically-acclaimed novels taking place in ancient Greece. The way the characters see the world seems like a very good guess at how it might have been. Like, a small thing, but the descriptions of a world seen only in natural light and firelight rings true. And the author doesn't make them naive, as though everyone is going off and praying to Zeus; the religious framework shapes their world view, but they don't relate to their gods the same way modern people do and also there are varying levels of cynicism. And there are clever precursors of the Christianity/Axial Age stuff on the horizon if you catch them. And she ties other abstract philosophical ideas easily into the story.
+1 to Dirk Gently books!
Also just finished Christopher Browne's book on investing. Mostly it was skimming because he, like a lot of others who teach value investing, is mostly trying to hammer home the temperament aspect. But a couple chapters definitely had some interesting explanations for things I hadn't understood as well before.