First off -- this is only on the vague periphery of sff in that the backgrounding is far-ish postapocalyptic instead of the original gold rush era in British Columbia. There's no magic and no tech that we don't already have (except possibly for some of the biotech that was in the bombs dropped during the far-distant apocalyptic war). The story itself could have taken place in the 1800s aside from incidental things like the existence of plastic chairs and doxycycline and the occasional availability of electricity from generators, but the difference in background does make a big difference in the message conveyed by the book -- namely that a beast is present in all of us, that we must choose to fight that beast, and that we must be ever-vigilant in our battle. The beast is illustrated by history (the past war is known as the Big Damned Stupid), by the physical scars left on the land (like a bomb-crater lake that remains poisonous), by the weather (these days there are frequent massive hurricane-like storms even in the Yukon, known as "thunderheads"), by the man who raises our MC, and by the MC herself and her travelling companions. Although the course of the book is not all that original -- many books feature an MC fighting against their own worse nature and the worse parts of both humanity and nature, as in a good number of westerns -- this one is well done and gets the message across very effectively without being offensively obvious (like, say, All the Birds in the Sky was).
This is written in first-person vernacular, which might have been annoying to read, but it was narrated convincingly in the audio version. We follow Elka, our MC, as she runs from her erstwhile foster father, who near the beginning of the book (and as told to us in the blurb, so it isn't a spoiler) has turned out to be a murderer. Now, here's the essential spoilery bit: I thought this was a werewolf story of some sort! But it isn't! I kept expecting Elka to eventually see him shift -- and there's all sorts of hints throughout most of the book that he will eventually -- but all those hints and pointers turn out to be the smartass author (I mean that fondly) referring to his inner beastly nature and to Elka's own shifting memories and perceptions and character. Sheesh -- way to lead me astray!
Lewis is also a smartass in playing the "repressed memories slowly returning" game, which can be intensely annoying and is annoyingly convenient for the author in allowing the revelation of bits and pieces of the backstory whenever Lewis wants you to know them. I thought this part of the story was less successful, especially since it was pretty easy to figure out what each drib and drab was going to be before it was revealed to us. And further, there are times that the heroine seemed TSTL even for someone who had spent most of her life in the woods -- but I may be judging the author too harshly here, because it never was claimed that Elka was especially bright in the first place.
And then there's the wolf companion, who was a fun character but presented much too heavy a hand in ramming Lewis's message home -- Look! It's called the Wolf Road! Here we are with a wolf befriending our heroine! Wow, what a nifty metaphor for wildness and our beast nature! -- and also was much too much the Lassie of the wolfie world (seriously, I thought Elka was going to ask "Did Timmy fall down the well?" at one point).