If the synopsis is accurate then the story behind that gorgeous cover should prove an entertaining read. I'm still warming up to the whole steampunk fad--and it'll likely be passé like zombie novels by the time I'm fully engrossed--but I do enjoy a good adventure tale that takes creative license with history and reality (i.e., The Golden Compass).
The American Civil War is gearing up and so is the Klondike gold rush, which prompts an inventor to create an amazing new mine drilling technology called the Boneshaker. But it winds up inadvertently unleashing a zombie apocalypse of sorts--zombies again!--on Seattle. Flash forward to when the teenage son of the Boneshaker's deceased inventor seeks to right his father's wrong and infiltrate a walled-off Seattle.
I guess there are a couple of short stories set in this universe as well, through Subterranean Press, which will have to suffice until I read the novel. Have you read this one yet? What did you think of it?