Maybe it will sound strange, but what I liked most about the book was not its content but its form: what a concise, structured, balanced and nearly perfect syntax! The sentences, paragraphs, sub-sections and chapters are of a perfect size and everything is written in a clear and comprehensible manner. The indentation and the typography for both text and titles were carefully designed and the kind of paper and the binding are of excellent quality, so the book is a pleasure to read and handle.
The book is an excellent introduction to linguistics or to how language works, starting from the anatomy of the vocal apparatus to how we produce sounds, from how we articulate them into a language to how we hear and distinguish language from noise; then it turns to how different parts of our brain process language to how we assign meaning and how languages are structured to better convey this meaning (how grammar serves semantics). It also includes sections on how languages are born, how they evolve and how they die, as well as how the currently existing languages belong to certain language families. Finally it concludes with how we can take care of languages in order to preserve the language diversity (and therefore the cultural heritage) of the world, since languages are extinguishing at an extremely fast pace, maybe even faster than that of the extinction of animal species.
The author covers a lot of topics, but for the same reason he delves not too deep into any of them. Regarding the topics that interested me most, I would have liked greater detail, but this is probably not possible in a book with such a wide scope. This book will probably lead you to some more specific sources in some linguistic area. Regarding the evolution and constant change of languages, as well as some specific examples of how these language shifts occur, I highly recommend The Unfolding of Language: An Evolutionary Tour of Mankind's Greatest Invention. For a deeper explanation of how the brain processes language The Stuff of Thought: Language as a Window into Human Nature by S. Pinker is a good choice, although I still need to read The Language Instinct: How the Mind Creates Language (P.S.), which is probably better. Origins of the Modern Mind: Three Stages in the Evolution of Culture and Cognition gives you an excellent overview of the evolutionary steps that led from apes to modern humans - vocal apparatus included -together with the changes in the representation modes (and thereby memory) involved in these steps (from episodic to mimetic to narrative or linguistic and finally to symbolic, which allowed for written language).