Just such a wild and good book. It could be described as "Moby Dick, except that instead of chasing a whale in a sailing ship, they're chasing a giant mole in a railroad train", and that would be accurate but also not. And it sounds ridiculous, and it is, but it works, and it's terrific.

It's also steampunk of a sort, but steampunk that's fresh and unique and not Just Steampunk.

It is a wonderful time, a rollicking adventure, a sweet romp, complete in itself, the loose ends not exactly tied up but not exactly left dangling. It is easy to imagine (and even long for) sequels, or other stories in the same universe, but it's also easy to imagine there won't be any; this was about perfect.

Highly highly recommended.