I liked Anathem. It's a good mix of physics, philosophy and fiction. I don't want to give away too much - I really liked the way things were unraveled slowly and I don't want to deprive anyone reading this review of the same. Don't expect a lot of action. Toil through the first 10% of the book (it was hard for me) and you'll be rewarded. Think of the whole book as a thought experiment.