This is it, the last Repairman Jack book before Nightworld. It's more focused than Fatal Error but it doesn't feel at all like an RJ story. It's full-on Adversary Cycle.
Jack takes his best shot at Rasalom, and fails. Glaeken and gang try to perform a ceremony on the q'qr baby in order to rob Rasalom of his power, and they walk right into his trap and inadvertently clear the way for the Change. Everyone dies but Jack and Glaeken.
Riddled with contrivance, this is really only a decent read for series completionists. I will be interested to see what the "heavily revised" Nightworld looks like with all this new plot shoehorned in there.