Read the books of The Inheritance Cycle! Eragon, Eldest, Brisingr, and Inheritance. They made a movie to the first one a few years ago, and I absolutely LOVE it.
The books don't have just one theme, but many put together to make the books what they are. They are my favorite and always will be, and I hope you take this to deep thought and actually read them.
The guy who wrote them (Chistopher Paolini) was fifteen when he started the first book, not intending to publish it. But his parents read it and thought it was great, then a famous publisher's son got a hold of it and BAM! it was published in 2003. The books are very large, Eragon being the smallest at 497 pages. In the back (this is really nice) there is pronunciation for all the confusing words.
It's a book of elves, dragons, humans, dwarves, an evil king, shades, monsters, growing up, love, action, mild violence, and finding your past. It also has some very sad parts. Each book unravels a mystery of his past and makes you want so much more! Please read these, they are lovely and amazing.
