Ancient civilisations - conspiracy theories - the death of planets - physics - mathematics - what more do you want from a book? I have never read a book by this author before, but have read things that are similar, and I have a guilty secret - I love this branded mix of popular science, wild theories and dire threats for the future.
The book starts off with a discussion about Mars and why it shows tantalising evidence that life once flourished there, but it is now a dead, dusty planet. The discussion has two main parts - that the stripping of Mars' crust was due to several high impact, high velocity comet strikes and that the enigmatic structures (nicknamed 'The Face', 'The City' etc) that have been photographed by unmanned explorers, are actually artificial. As the book progresses, the science and theories focus on more on the possibility that future comet strikes could target Earth, just as they have in the past, bringing the end of the ice-age and the start of the current human civilisation (current, because these authors believe that a more ancient civilisation once ruled on Earth and they were wiped out in the accompanying flood, fire and ultimate climate change). Throw in a couple of rants about why scientists seem to overlook the obvious (!) and why governments aren't doing enough to track these near-Earth projectiles, and you have an interesting read.
I do have niggles ... less about the theories put forward, which I'm more than happy to except with an open mind and a deal of thinking, but with the structure of the book. There is a lot, and I mean a lot, of repetition. Not everything is dealt with in chronological order and it jumps about a bit, repeating itself whenever it strays too far from the original train of thought. I also hated that the fascinating photos and diagrams were never referred to at the appropriate point in the text (ie. 'refer to figure 1...'), so I ended up puzzling over paragraphs, only to find a photo a few pages on that explained it perfectly!
However, overall, I really enjoyed reading it. The authors have a clear theory that they have found evidence to support. They freely admit that it is a theory. I liked the foray into maths and physics ... its been a while ... and it is written a way that is easy to understand.
As to the overall threat to planet Earth and the exploration of Mars ... I suppose we'll just have to wait and see.