For some time now, Philip Roth has been tidying up his past publications page, shuffling his previous books into five main categories: Zuckerman books (novels about his novelist protagonist, Nathan Zuckerman); Roth books (novels about Philip Roth himself); Kepesh books (novels about his academic protagonist, David Kepesh); Miscellany (non-fiction-ish books about writing) and a vaguer category of "Other Books". With Nemesis, he has introduced a new category, "Nemeses: Short Novels", in...