If I had to recommend just one book about investing, I would recommend The Bogleheads’ Guide to Investing. It presents information in a very easy to digest format and the authors cover many different subjects that are relevant to all stages of life, from what to do with that first paycheck, all the way to how to plan an estate.
I was able to skim through the book in a single night, mostly because I am already familiar with the Boglehead approach to investing. Hint, it is the same one advocated by Vanguard.
So if you haven’t jumped into the investment pool yet because of fears or apprehension, then this is the book for you. If you are already swimming in the waters and want a refresher, this is also the book for you.