I read an ARC copy I found at my local bookstore.
I gave it one chapter before I gave up. I didn't particularly care for the tone of this novel at all. It's disconcerting to have a thirteen-year-old leading what initially comes across as an innocent middle-grade adventure novel who actually sounds like he may grow up to be Patrick Bateman from American Pyscho. I gave Undertown a shot, but it just wasn't for me.
I gave this ARC a shot on January 14, 2015 and my review is also on Goodreads.