I am delighted to be part of World Book Night, an inspired idea which, like all the best ideas, is quite simple: let us gather one million books, get people who love them to give them away to a million people who might love them, who might give them away to other people who will perhaps love them. A problem shared is a problem halved: but a book loved and then shared and shared again is a book doubled, then tripled, then quadrupled...