It seems to be some sort of digesting process. Series 3 didn't upset me so much as challenge me as to how the different developments could fit together. It's similar to the challenge that THoB posed, I think, only there's much more of it and I don't think we have all of it. I seem to be chewing on little nibbles at a time.

I was very amused by the mathematician part and the title of the book by Dr Holmes (I'm assuming she has a PhD because academics aren't usually producing publications of that mass with fewer degrees).