His mission is urgent: Of the six thousand languages spoken in the world today, only six hundred may survive into the next century. Abley visits the exotic and frequently remote locales that are home to fading languages and constructs engaging and entertaining portraits of some of the last living speakers of these tongues. Throughout this exhilarating travelogue, he points out that the same forces that put biological species at risk -- development, globalization, loss of habitat -- are also threatening human languages, and with them, something very basic about their speakers' cultures.