I really liked the first three novels in this series, but had several problems with this one:

The main characters - Hardwick, Guerney, Madeline - all seemed like miserable caricatures of themselves. Case in point: I don't give a shit about the chicken coop.

There's only so much I can take of the "it could be this OR it could be that" of the mystery without any forward movement.

I actually skipped the whole part of the Fair, which is where I guess we learned who Peter Pan really was, but by that point I no longer cared.

Which is a bummer because I loved the big reveal! Soon as I read it I thought "YES!" It all made sense. But it took way too long to get there.