I'm at the library looking for a fiction book to write about. What would you suggest?

This is my last writing assignment of the year and I’m looking forward to just being done. So I’m hoping I’ll find a good, short book that I can just read, write about, and be done with. But at the same time, I have about 3–4 weeks to finish this (I’m home schooled and am slightly behind in some courses), and I’m not doing a whole ton else, so I can spend time reading if I find a really great, longer book.
So, with that said, what book would you suggest? Thought-provoking and controversial would be a plus. I love having something to debate about with myself and my friends.