Simply Riemann

Doesn't assume too much of the reader, although if you don't even know the basics (like what a variable is) or dislike math it might not be book for you. If you have any curiosity in your soul at all, you should want to know a little bit about Riemann. He was an important precursor to Einstein's work, among other things, the most famous being the Riemann hypothesis regarding the mystery of primes, which appear to have a hidden symmetry in their randomness.