Indexing: Reflections (Indexing Series) - Seanan McGuire
Henry finds a way back home -- of sorts, and at a great cost. We learn a whole lot about Sloane, about the early days of the ATI (and it's predecessors) -- and I even expect a lot of this to come back and be relevant.  
I just don't know what to say about this installment.  Was it interesting?  Yes.  Does it set up all sorts of things for the future in terms of character, plot, and everything? Oh yeah.
But, it didn't grab me, didn't get me invested, didn't do anything really for me at all, but I think I know where it tried to and it just didn't succeed. All it managed to do is whet my appetite for Episode Nine.