I kept hearing a bout this book and I FINALLY read it. The writing style/prose was unique. It had a very fantasy/ fairy tale-ish vibe. Although, to be honest, I found the book a little slow at times. The world building and detailing for the Underground where the goblins live was fantastic, but I found it hard to enjoy Elizabeth's point of view. She appears, at times, to be self pitying, and jaded. 
 While Kathe was in the goblin realm, I found Elizabeth to be somewhat bratty and selfish. She did not try very hard to get out of the house and go help her sister. I do understand however, that she is meant to be portrayed this way, her imperfections and flaws openly shown to the reader. I do plan nonetheless, to read the second book once it comes out!