Meh. Not bad but not great. I had a hard time believing that this society could not come up with any technology for "movable light," even candle technology, in 200+ years. I had a lot of issues with the world of the story. Why wouldn't the builders allow books or any information about the past to be passed along to the city dwellers? There could be reasons for this but the author didn't seem interested in justifying this puzzling choice. The other thing that nagged at me was Lina's school friend in supply shows her the things her new "boyfriend" in supply is giving her. The boyfriend character is portrayed (though he isn't much more than a mention) as an adult. It's established at the beginning that Lina and her school friend are 12, so this guy is pursuing a 12-year old?? Creepy.
Whatever. Will probably check out the movie for the girls though.