There's a scene toward the beginning of this book, where Dragonfly looks through a window at the stolen children, eating a plant called sparsely, while a creepy handler called 'Eagerly Meagerly' walks up and down between the tables, that reminds me quite strongly of the game 'Little Nightmares.' I couldn't help but imagine Eagerly Meagerly as those doughy, long-armed nightmare creatures, which I suppose didn't hurt anything considering the theme of this book, though thankfully Dragonfly never eats any helpful gnomes.
I really loved the atmosphere of the beginning of this book. All the way up until the vampire fight in the glassworks, I quite enjoyed this. The rest.....Durbin's writing hits right at the top of my tolerance for purple prose. I don't do well with it. That lurid style of over describing nightmarish things with almost-but-not-quite contradictory terms so famous in Bradbury's works is somewhat present here; not entirely, or I'd never have finished it, but it's definitely an element that Durbin enjoyed - sometimes to the detriment of the story he was trying to tell.
This story does a lot of things differently. It's not a tightly woven story; it's not fast-paced at all, and the characters really meander and get lost in the setting before coming back to the overarching 'defeat the baddie' plot. I'm tired of reading the same old stories, and this is definitely not my usual, so I really tried to enjoy this book; but I think it moves too much the other way.
There are a few things set up at the beginning, in those first four to five chapters, most notably that scene through the window. Dragonfly sees for the first time some of the truly bad things happening in Harvest Moon, the land beneath her basement, in those forty stolen and starving children, and privately vows to rescue them. To a reader, this feels like the set-up for a later rescue of which Dragonfly is a part. But, no - most of these children that Dragonfly sees have horrible ends, only one or two of this group live through their ordeal, and their rescue is facilitated by other people Dragonfly doesn't even know. She isn't even aware of the rescue of every stolen child in Harvest Moon until the wagons full of freed children roll up in the woods.
It's also heavily implied throughout that there is some important reason for Dragonfly's coming along with Mothkin to Harvest Moon, some secret power or ability or her own personal drive for justice that will help carry the day. In a way, this may be true since it turns out the Great Shadow Lord Quillum is somehow attached to her, impersonating her actual shadow, and he....helps? a bit?....in a final battle at the very end of the novel. But nothing of her own doing actually helps; I mean there are little things like her using a flashlight, but not anything no one else could have done in her place. In fact, she often reflects that many bad things have directly happened because of her presence in Harvest Moon that could have been averted had she stayed at home. Even something as simple as Hain wanted her because she had super special dream powers, being groomed from childhood to be just right would have worked (which is hinted at, but I'm not sure is actually why Hain wants her so much; Willie's dreams are implied to be just as powerful).
In the same way, characters set up to be important movers in the book - Mothkin, mostly, but also Singer - disappear entirely for literally half the book. Mothkin is built up as being this strange man with powers or knowledge of how to defeat the creatures in the basement; Singer is the first ally we meet in Harvest Moon, and we go through an extended battle sequence with both. But by the end of chapter seven, Dragonfly and the reader are separated from Singer & Mothkin, and we don't honestly know if either are dead or alive until the end of chapter 17. While they are both called 'A.P.K.s' (Agents of the Peaceable Kingdom), and are part of the final group to ascend the cliffs, once they've returned to the page they're just another name in a list of many as the core group expands to include Uncle Henry, Clara, Willie, Muriel, and many of the Gypsy men. Mothkin has the final battle, but also not really. Singer heroically dies for the cause, but in the end what kills/deters all the evil - is moonlight.
In short, Dragonfly was really a useless character, filled with some weird Author-Is-Obviously-A-Guy moments (what ten year old girl is pining over the musk of a boy, werewolf or not??); nothing set up had a follow through, and nothing that happened was set up. The book really tried to be more of the type that just explores another world, and quite possibly would have been a better read if there wasn't some evil villain attempting to take over. If, as the set up at the beginning suggested, there really were just creatures in their basement and it was a little more lighthearted, all that worldbuilding could have just taken center stage. Dragonfly wouldn't have needed a stronger arc like this book really needed, and could have just been along for the ride to see all the wildly fantastical forests and towns.
And really, just once, I'd love to see someone NOT include 'Sam Hain' as some literal actual god striding up and down the Celtic countryside, extracting terrified worship from the mortals every year at Halloween. Bradbury did this too; I don't know why so many writers (and TV shows! Looking at you, Supernatural!) decided to make an actual holiday into a living [evil] god. I dunno, it's like....making New Year's Eve actually be some secret demonic deity of the ancient Americans who demanded worship through the use of fireworks and kisses at midnight. Stop it, you look dumb.