It Was His Sled: The fact that Ember is an Underground City is not found out until the end of the first book, but good luck finding someone who treats that like a spoiler (Hell, it even says this on the main page!).
Paranoia Fuel: One doesn't have to be a rocket scientist to figure out that the situation in The Prophet of Yonwood (the U.S. battling a terrorist nation that threatens total war) is a natural progression from what the world is going through today.
The film adaptation:
Awesome Music: "One Last Message", perfectly fits over the credits and end sequences.
Idiot Plot: There whole thing happens because the Buildersnote who are so talented that they could build an entire city underground and reasonably expect it to be sustainable for two centuries- thought it was a good idea to have the key to leaving the city sealed inside a box, and for it to be passed down from one mayor to the next despite none of them knowing what it was for. This admittedly is an Adaptation Induced Plothole — in the book, the box with the instructions was kept in the basement of the town hall, until it was stolen and taken home by the seventh mayor, who died before he could tell anyone about it.
Alternative Title(s):The City Of Ember, City Of Ember