This book is a good enough read in that it pulls quite a few threads of modern cosmological thought together, but it doesn't take us anywhere new in terms of explaining the meaning of life, the universe and everything. It seems as if the authors are desperately struggling to free themselves from the need for God (what they appear to barely disguise as 'the anthropic view') and only succeed in making a creator all the more likely the only explanation out, which is frightfully pesky when one wants to be so Dawkins chique. Of course Dawkins and his anti-God crew flounder on these same rocks of the infinite beyond creation, which is why they so studiously avoid cosmology.
In the end the authors' branes collide with the fact that they need to draw their entropy balancing energy from gravity, which neatly gets them nowhere. Until the gravity waves they need are found and measured, their theory goes on the pile and the big bang and inflation, with its mysterious cosmological constant, reign supreme, pointing to that God who is subtle, but never devious.
Maybe one day someone will get around to writing a book having a go at explaining some possible solutions to a lot of the things they don't seem to have pictured, such as the progression of matter from its inception and gravity formation after the creationary startup, the filling bounce which rocked the expansion constant, how and why dark energy grew in influence, how matter is still merrily deposited, why there will be an accelerated, polarised collapse and why a second big bang need not be followed by a third etc. If so I hope it's done in quite so easy going a way as they have managed. Now where did my tongue get to? Oh! Here it is, stuck firmly in my cheek.