I’m still on this McWhorter kick. This one was good, but not as good as some of the others. It’s about English and its interactions with other languages. The bulk of the book is about the idea that repeated conquests of English speakers resulted in English being particularly simplified in terms of its grammar, especially compared to related languages. There is also a large section on a proposed link between Celtic and English grammar, and even a section positing links between German and Hebrew. The latter idea is based on the work of Theo Vennemann, whose ideas are (as far as I could tell from google and wikipedia) found to be interesting but probably wrong.
Because it’s McWhorter, there’s also a long lament about the popular usage of the Sapir-Whorf hypothesis. You get the feeling that his later book “The Language Hoax” was a great unburdening of linguistic angst.