Read the other reviews, and particularly the editorial reviews and quotes. As many have said this book ought to be read by any sentient individual who cares at all about 9/11.
Like most, I have previously completely dismissed the conspiracy theory nonsense of 9/11. But then I chanced upon this book, and because of the testimonials from intellectual heavyweights and other respected people (including a respected Member of Parliament in the UK), I wanted to know more about it. In it's favour are the following points:
1. Griffin is no consipiracy theorist, far from it. He starts out by saying he too completely dismissed such nonsense until a very sane and eminent respected friend of his suggested he look into the subject.
2. In the later pages of the book, he suprisingly second guesses all his earlier assertions, and looks at them from the point of view of the supporters of the official account of 9/11. He asks of himself "Am I actually talking rubbish?" and then conclusively proves that he is not.
3. Finally, all he's asking for is a full independent inquiry into 9/11. That's it. He's not being anti-Bush or advocating bringing the Administration to it's knees. All he's saying is: here's the actual, recorded, undisputable facts about 9/11, here's the official account of 9/11 (which has changed significantly over time), why are there such huge and worrying differences between the two?
So, yes, read this book. And I very strongly recommend a look at Into the Buzzsaw: Leading Journalists Expose the Myth of a Free Press by Kristina Borjesson (you can look inside on Amazon.com) to understand exactly why you haven't already heard this stuff in the mainstream media.