World building & pace: Okay, so first let me clear out that this is a dystopian book where something happened with the clima on the above and some selected people went to live below, but then some weird thing started to happen to the people below and some of them started to become mermaids, for some reason unknown. So if this kind of thing bothers you - things happen and are never given a good reason - just stay away from this book, for me it wasn't a major turn off, it bugged me a little but I could suspend my disbelief and keep going. But the thing that DID bothered me was the pace, oh boy this book was slow, and slow, and slow, and them BAM! everything happens in like 10% of the book and it's finished and that was it. Now, I don't mind slow books - hell, The Vanishing Season was more slow than this and it's one of my all time favorites - but it bothers me when there is things that should be happening and are not, and them pisses me off when things are rushed to make it fit on the ending, NOT PLEASED.
Recommended to: readers who want mermaids or really liked the atlantia idea when they're kids (which is why I picked this one up), readers who liked Ally Condie's other works.