The City of Ember

I was very impressed with the premise of this book. It is a young adult book and there are a few things that fall together a little too neatly for me but overall I thought it was a great read. I didn't even want to put the book down for the last couple of chapters. It isn't a fantasy book and it really isn't sci-fi so I don't know why it was in that section perhaps the next book in the series unveils more.