Haunting Weir was a weird book for me to get into, but the mood, the uniqueness, and the speculative fiction wins the day.
First of all, the conflict is mostly man versus himself, one of the classic conflicts of literature. It's really Art, the main character, battling a demon with himself (this happens fairly early in the book so it's not a spoiler).
Sometimes I felt as if it were Art battling an ongoing sickness. You know, the one like when you have the flu, and you feel you have to report at the office. On the subway there you feel a huge ache in your stomach... and then you down a syrupy-taste medical drop... and you feel better for a little while, just until you get into the office. Then you wonder, should you go back home immediately and surrender, should you stay on and tackle those reports due by five p.m., and then after looking at yourself in the mirror in the public washroom, you say yes, I can do this. (In fact Art does take magical and mythical candies to keep the demon at bay). Then you have another major migraine come on, and a co-worker comes up to you and offers some water, and helps you feel better, so you stay on your mission to get those reports done.
Sorry, I'm rambling, and that's entirely unfair to this book, because it does introduce some very interesting characters, although some of the concepts are quite quirky (i.e. how a romantic couple of different species are tethered to each other, and how it's possible for Art to host a demon bigger than him, not quite incorporeal but also capable of being corporeal... I couldn't imagine it, despite trying) it's very fascinating, like reading another world. While, as said, it's hard to develop an entire book on man fighting himself with less external conflict than internal conflict, this book manages to pull it off.
The mood is dark, gloomy, and very Gothic. The monsters and magical creatures that inhabit this world are very inventive and unlike those I've ever read before. For that creativity and originality I give it four stars, although overall I found it a little weird. (And I do love weirdness in stories, so I'm surprised to hear myself say that--must be that I like a normal, Earth-type world as the base system, and this book has a different world, although one can imagine it being somewhat akin to late medieval Europe with its bands of roaming knight guilds acting as greater good mercenaries).
The writing style is very consistent, and I appreciate that. Pacing between description and action is very even, with many little flourishes of exploration, impending danger, action, and resolution.
My favourite part was when they are inside the Consciatorium. (you kept thinking, is this the right place, or not--nothing is as it seems!)