I recently had a chance to read A Universe From Nothing, a Charlie Munger book recommendation. It takes the layman through what scientists believe to be the history of the universe, and why they believe what they do.
In the past, I've tried to read the books aimed at the layman that Einstein and Stephen Hawking have authored, but at some point I just had to give up because I started to get lost.
That was not the case for this book. I may be more layman than the average layman in this area, but for the most part I could follow Krauss as he described in general terms some of the advances made in this field.
The twist Krauss adds to the story is a plausible explanation of how the big bang (and thus the universe) may have come from nothing. Be forewarned that if you're a rather religious person, you may be offended by this book!