Others have detailed the contents of this book very well. I enjoyed Magueijo's writing and think the tome is a reasonable balance between technical detail and fascinating anecdotal accounts of the scientific publication process. Some reviewers have complained that the book never describes the author's actual VSL theory, but I think that was a smart economy. Including those details would make the book unwieldy. Majueijo's papers explaining VSL are readily available online ([...] and there is no benefit in loading down this book with them.
What I found most intriguing is the book's depiction of extreme intolerance on the part of established science to even entertain what is a very reasonable hypothesis. Detractors of VSL talk about the "physical law" that requires the speed of light be constant. But there is no such law. We say the speed of light is constant today, but we have no reason to believe it was constant at the beginning of the universe. C is a cosmological "constant" with no supporting experimental evidence, for the simple reason that nobody was around to observe the speed of light during the big bang.
Reading Magueijo's actual paper and follow-up documents, one sees a reasonable presentation and defense of a hypothesis that fairly well fits contemporary observations of the universe. What those papers don't reveal, and what the book documents, is the scientific establishement's behind-the-scenes manipulation undertaken to squelch discussion of the VSL theory in legitimate scientific venues. That's not science. That's religion.
Although this book is an admitedly one-sided view of Magueijo's battle for VSL, you can readily corroborate some of the scientific press' outrageous obstructionism by simply reading Internet discussion groups. Magueijo may go over the top in his characterizations of his opponents, but he raises a very legitimate question about the integrity of those holding the purse strings of scientific research.
