The tweeners, sure. That's just smart marketing on the part of authors who release their main series novels once every 2-3 years. I'm talking about the author who's giving us her/his three--nay, four!--book magnum opus. Just once, I'd like to see a series author say, "I tried to wrap it up in three decent-sized novels, but I didn't want to rush things. So here's an additional 175 page book that wraps things up quite nicely I think." The End.