If you have a good appreciation for Bogle/Vanguard and Bernstein, which can be had merely from internet sources and wiki entries, I would recommend Smartest Portfolio by Dan Solin, who relies on Fama and French (nobel laureates) as an accessible 'investing' book.
One needs to know if they are looking to learn about technical aspects of investing (much of which you might take for granted, now, like what are equities, bonds, mutual funds, etfs, etc) or strategic aspects, which I am coming to appreciate more, such as optimizing taxation, asset allocation, portfolio theory and efficient frontier, and safe withdrawal rate, to name a few.
The best recommendation, though, is to keep reading a lot. You will realize that you are a beginner in a lot more areas than you might think, which opens the door for more improvement and badassity. That's Mustachian, my friends.