Non-fiction: I found "Arcanum" engrossing. It's the history of the discovery by the West of the formula for porcelain. I know, sounds boring, but it involves a "alchemist" being forced into service to find the secret of turning lead into gold, only he figures out how the Chinese made porcelain. Voila--Europe's porcelain industry.
I have "Emporer of Scent" on order now, don't know if it's good. It's about a man with a valuable sense of smell, and how the perfume industry works.
That sort of thing fascinates me. Along those same lines I recently picked up a remaindered book, "Technology in the Ancient World" by Henry Hodges. How much we take for granted!