Is it ever worth reading the Afterword, the bit at the end of a book that explains how it came into being? Below is an excerpt taken from Porcelain, the coming-of-age memoir written by musician and DJ, Moby: “When I first talked to a literary agent about writing a memoir I mentioned that it would be really fun to hire a writer. My literary agent said: ‘You’re descended from Herman Melville. You need to at least try to write the book on your...