The Great Gatsby
I don't think I can ever do justice to how I feel about this book. The first time I read those last few lines I just gaped at the page - what makes me do that anymore? 'Gatsby' is at once so angry, bitter, and hopeful. Even though it seems to Nick that everything good has passed away, replaced with ostentatious wealth and idle pleasures or the seeking of them, and those who aren't a part of this game inevitably suffer for it, there is hope in Jay Gatsby. That's its futile doesn't take away from the power of it.
Fitzgerald's writing is immaculate, full of wordplay and suggestion, but never obscure. I love this book.