The protagonist, stomping about in her muddy boots, was enjoyable. The gwyllions made me laugh out loud, and the boggart was as tricksy and amoral as a creature of faerie should be. The last minute revelation of a character whose knowledge could have made the entire plot unnecessary was irritating. 

It was a bit mystifying that ultimately Autumn’s trust in the boggart is misplaced, since her faith in Cai (another “monster”) is an important plot point.