The book is mostly written in a non-academic manner and is very easy the grasp if you have some basic gist of a few famous philosophical ideas.
Here's a relevant TED talk the author, Sam Harris, has made.
Needless to mention, the book has persuaded me with its ideas (so far), one of them being the invalidity of moral relativism. Two short key excerpts from the book, directly about this point:
The Moral Landscape, p. 27 wrote:Many of these people also claim that a scientific foundation for morality would serve no purpose for any case. They think we can combat human evil all the while knowing that our notions of "good" and "evil" are completely unwarranted. It is always amusing when these same people hesitate to condemn specific instances of patently abominable behavior. I don't think one has fully enjoyed the life of the mind until one has seen a celebrated scholar defend the "contextual" legitimacy of the burqa, or of female genital mutilation, a mere thirty seconds after announcing that moral relativism does nothing to diminish a person's commitment to making the world a better place.
The Moral Landscape, p. 45 wrote:Moral relativism, however, tends to be self-contradictory. Relativists may say that moral truths exist only relative to a specific cultural framework - but this claim about the status of moral truth purports to be true across all possible frameworks. In practice, relativism almost always amounts to the claim that we should be tolerant of moral difference because no moral truth can supersede any other. And yet this commitment to tolerance is not put forward as simply one relative preference among others deemed equally valid. Rather, tolerance is held to be more in line with the (universal) truth about morality than intolerance is. ... Given how deeply disposed we are to make universal moral claims, I think one can reasonably doubt whether any consistent moral relativist has ever existed.