I think this book would have benefited from, well, not existing. What I mean is that the author should have made it into a duology instead of a trilogy, since it was only at 65% of the book (yes, I noted that down) that things started happening.
I still had a good time just going along with the characters, but only because I'm attached to them; what this book needed was plot, and maybe some more character development, because it felt to me that Jeremy ended the book in the same place where he started at the beginning of the first book (though Jean did make progress, which is good).
When you compare it to the first trilogy, all books felt like each of them had a purpose in itself, besides the bigger purpose of the trilogy in itself. The new trilogy doesn't feel like it has one, we don't know where we want to arrive, and at the same time, it feels like we're not making enough progress to satisfactorily arrive there in the last book.
Anyway, of course I'll read the next one, and I'm pretty confident it'll be better.
ps. yes Jean with a dog was the best thing that could've happened.