The correct answer really depends on what you're into, and what kind of person you are. There are a lot of subcategories in fiction (just like there are in non-fiction). Lord of the Rings is much more than mere fiction. It is possibly interesting from a linguistic PoV as it contains an entirely new language called Quenya developed by Tolkien. It also contains a lot of subjects which are relevant IRL. Without getting…
+1 on Ghost in the Wires. You could also try On wings of Eagles, a narrative of a rescue of EDS employees during the Iranian Revolution. Wikipedia tells me that the genre is called Non-fiction novels.
While I'm trying to steer more towards reading books I made the rule to not watch a book of a movie I've seen. It just doesn't work very well for me (other way around seems fine).
So yeah, the movie spoiled it for me...