I truly loved Cloud Atlas. It's also a rare example where the book and movie adaptation both lift each other up (though I saw the movie first, and can't know if I would have felt that way in the other direction). I felt like the movie is better at emphasizing the thematic connection between each story, while the book is better at showing the impact of each story on the next, and showing that each story exists for the characters in the next. I loved the movie even more after reading the book.
Antifragile for nonfiction. It really changed the way I think about how both the natural world and human institutions function.