Thanks very much for the kind words, Habs Fan
It seemed like the Shedai were basically done after the 3rd book. I would hope that we are moving on to other things in book 4.
The Shedai aren't done. Indeed, they are an integral part of the entire Vanguard
That said, Open Secrets
is by necessity a departure from the first three books. Bills have to be paid, etc. I suspect Dave's forthcoming fifth book also will be rather different from what's already come to pass, due in no small part to a couple of curve balls we think we threw him.