This is an interesting book. I liked the plot, but something about this book fell flat for me. 
 It was very simple and straightfoward. There was a lot of mystery, but at the same time, the mystery felt very obvious. Somethingh about it was dumbed down, and it is definitely aimed for the really young end of young adult. 
 I liked the city of Ember, but that was really about it. There were a few things that were hard to believe. Like when Lina's grandma dies and Lina didn't seem to really care that she died. Or the fact that she didn't seem to care about her younger sister. Oh, and in 2oo+ years, no one has really tried to get out of the city? Seriously? Anyway, the characters weren't very interesting, and no one was particularly interesting. 
 Overall, it was just okay. I give it a 2 out of 5- it's a simplistic story, and I felt like it was dumbed down a little.