The Stranger, by Albert Camus

Great, great, great. And deeply disturbing, as well. The idea that drives the story shocked me into thinking that life can't be lived like that, that there's a lot more to it which makes every experience worth enjoying and cherishing. The main character slowly develops this attitude that nothing in life really matters because our death, our finality, beckons to us from the moment of our extinction. Like a black wind that blows from our future to our present annihilating everything in its path. By the way, I'm nearly paraphrasing Camus when I say that. I don't have enough good words about this book. It takes only a few hours to read it, but afterwards you could easily find yourself spending several days reflecting about existence.