This is a book for anyone fascinated by languages. The author visits speakers of some of the most threatened languages in the world, visiting Australia, USA, Canada, Wales, France and The Isle of Man. He explores why the languages are threatened, looks at the structure of the languages and what is unique to each of them, what the world would lose if each of these languages were to disappear. He also looks at how people are trying to keep their language alive and tries to assess whether each language has any chance of surviving. Anyone who thinks it isn't worthwhile for local authorities in Wales to publish everything in Welsh as well as English should change their minds after reading this book.