This isn't really a book that you sit down and read, but it is a great reference for any Wodehouse fan. It lists every character with a speaking part, as well as some others, and identifies which works they appear in. It also includes a list of all his works with both British and American titles, listed both in alphabetical order and by year of publication. If you are building a Wodehouse collection, this is a good book to have--try to find a used copy.