We are a homeschool family so getting books for curriculum and for free is a pretty big deal.
Kids books that adults might like are: a series called "The 39 clues" a very fun series, written by several authors using history and geography to solve the big mystery. I found my son getting answers correct on "Jeopardy" just from what he'd learned and researched on these books. He also LOVES American History- he somehow travels through world history and ends up back here. Oh well. He adored "Destiny of the Republic- Madness, Medicine and Murder of the President" about Garfield. Not historical fiction, but very good non-fiction.
I truly recommend Librivox.org for free downloadable audiobooks. Anything on public domain is there....for freeeee! I just finished Jane Eyre by Charlotte Bronte. Long book but a real gem.