Thanks for all your kind words. Chapter V is almost done---it was almost done
this summer, and then I moved house. But it should be done soon.
Chapter VI is well under way. My editor and I have agreed
that my draft deadline will be at the end of February.
So I expect some major progress in the next couple of months.
Sorry for the long delay. Some of the delays were logistical (moving
and illness) and some were because it's a hard book to write
and I am making it absolutely as good as I possibly can,
and that takes time.