I was a bit skeptical on this series after the second book, but this book really set my hopes back up to high for this series. It's fabulous. Some parts were a bit indecipherable because of the lofty writing style, but other than that, everything about this book was golden. 
 I still don't get the "cut the moon in two" part about the title, but I guess it does make some sense. A lot better than the second book's, whose title I didn't really get (because September never leads revels in Fairyland-Below). 
 This book fleshed out the world of Fairyland a lot more and throughout the entire book it has you questioning about the Fairies' true nature on the inside. While the first book was merely a joyous adventure that dealt with hard experience for poor September, and while the second book dealt with the magic of Fairyland, this book dealt with the people of Fairyland--who they are. This book also talks strongly about who a person really is, not what people assume they are. That's probably what made me love this book so much: it carried such a strong message. 
 Another reason why I liked this book is possibly because of the reappearance of Ell and Saturday, except now we see that both of them are far more troubled than they were previously--as well as September. You can tell it straight out in Ell--he has a curse, and so whenever he breathes fire, he shrinks. This turns out to be a very big issue in the entire book and meddles with Ell's self-confidence quite a bit. 
 Saturday is a little harder, but as he, September, and Ell journey across the Moon to stop Ciderskin the Yeti, we see that he took September's absence quite terribly, as did Ell. As their journey progresses, Saturday also has to deal with older and/or younger versions of himself, and he has to explain to September about being a Marid. Quite obviously, his relationship with September is quite the roller-coaster ride. 
 The plot was fantastic and I loved the many plot twists at the end. The interludes, told in the Black Cosmic Dog's view, build up the suspense and make you wonder what's going to happen at the end (even though there are only 2 interludes that probably only make up 4 pages altogether, and I applaud Valente on doing such a fantastic job). There are many cliffhangers throughout the book and we also have Charlie Crunchcrab's laws on the sidebar. So many plotlines. All fantastic and concluded wonderfully. 
 As I stated previously, the writing is a bit difficult to comprehend, but I was fine with that, because it feels a lot toned down from The Girl Who Fell Beneath Fairyland. 
 The pacing is just as quick as always, and by the second chapter things have already taken place. The worldbuilding is wonderful, and the characters are once again as quirky as they were in the first book. 
 Even though the next book in the series, The Boy Who Lost Fairyland, doesn't center on September, I'm very excited to read it. Why? 
 No, not because it partly takes place in Chicago, my hometown. Because the Fairyland series is awesome and I don't care who or what the story focuses on. Also, the changelings really intrigue me. 
 My review of The Girl Who Circumnavigated Fairyland in a Ship of Her Own Making 
 My review of The Girl Who Fell Beneath Fairyland and Led the Revels There