I agree with the people who say that the 4th book felt like a better ending for the series. I just found this one a bit boring, the events were interesting on their own and had twists I liked but I wasn't engaged by the overall arc of the book.

What happened to fenchurch? I thought she was a great addition in the fourth book!

I think the series is still fun but it's disappointing that the last book was the one I enjoyed the least.