You are about to begin reading Italo Calvino's new novel, IF ON A WINTER’S NIGHT A TRAVELER. Relax. Concentrate.' Calvino's masterpiece opens with a scene that's reassuringly commonplace. A reader goes into a bookshop to buy a book: not any book, but the latest Calvino, the book you are holding in your hands. Or is it? Are you the reader? Is this the book? Beware.