This is quite a misleading book. It emphasises its accessibility to the non-specialist reader when, in reality, it's pretty heavy going and complex. I'm currently studying a Master's degree in an area of linguistics (with a BA in English language and linguistics), so I'm not a complete layman, but even I found it indecipherable in many parts. The description at the back, as well as the introduction, market this as some kind of good introductory book on Noam Chomsky's incredibly important contributions to the theory and philosophy of language, but I think that the general reader will get very little out of it. With some knowledge of linguistics, and the help of the not always useful commentaries at the back of the book, I was able to struggle through, understanding the major points, but getting completely lost with the more technical descriptions.
The main part of this book (not including the commentary and the many appendixes) has been split into two halves, "the science of language and mind" and "human nature and its study". The first half is definitely only for the specialist reader, dealing with the technical side of Chomsky's theories on language. The second half, however, is far more accessible, presenting more of a philosophical inquiry into the nature of language, and humanity in general. I found this half absolutely fascinating, as I've always admired Chomsky the eminent linguist, and Chomsky the highly regarded political commentator, but I'd never before encountered Chomsky the revered philosopher. Chomsky sheds light on how his contentious theories on language underpin his entire moral framework, and how the philosophy of language is fundamental for our understanding of human nature, yet criminally undervalued in academic circles. Incredibly interesting, but heavy going.