I am reading a pair of books by Ernie Zelinsky right now (How to Retire Happy, Wild, and Free is the one I'm starting with) and enjoying them. They focus much more on mindset and what you will do all day than on money though.
A Simple Path to Wealth comes universally highly recommended around these parts though I haven't read it yet.
A Random Walk Down Wall Street is good for understanding how individual investors should approach the stock market, but that's narrower than retirement as a whole. It's written by an economist so it gets much more into explaining why things are the way they are than simply prescribing tips.