I love, love, love the cover of this book. It's so pretty! I picked up this book for several reasons. I've never read a book that deals with mythology before (and I don't know why not because mythology is fascinating). I also really like books with time limits; 6 months, a year, 24 hours, a week, whatever. If there is only a certain amount of time allowed to accomplish something, I wanna read about it. 
 The love triangle: The choice between Cole and Jack. For me, I typically like the first guy. But the way this book is written makes it hard to decide who came first. In the beginning of the book (the present) you meet Cole first, but then you take a step back in time (the past) and Jack is her boyfriend before she met Cole. I read quite a few reviews before reading the book that were "team Cole" and that surprises me. After reading the book I don't like Cole at all. He's devious and underhanded and doesn't deserve Nikki at all. 
 I enjoyed the alternating present/past sections of the book. All you needed to understand the present were the little glimpses into how Nikki ended up in Everneath in the first place. Which was the fairly typical misunderstanding, with a bit of deviousness by Cole. 
 What I wanted more of: More mythology and more Everneath. This was the only disappointing aspect of the book for me. A lot of the story revolved around Nikki and Jack or Nikki and Cole, not so much the mythological part. You learn very little about the Everneath in this book and I want to know so much more. I'm sure this was by design, as it is a trilogy. I'm looking forward to the next book. 
 You should read this book if... you like mythology, YA or dementors