John Edwards has written a book about everything that happens when languages meet, a book about ‘the social life of language'. With his encyclopaedic knowledge he composed a small but complete encyclopedia of multilingualism that has an intriguing fact or an original insight on every page. Before readers realize that the subject-matter is complicated, they have already understood it, since Edwards wears his knowledge lightly and writes with apparent ease. A book for everyone who has to cope with diverse languages, that is, according to this book, nearly everyone.