When I first began reading this book, I didn't expect a novel quite as dark as this. It has sort of haunting imagery that really stuck with me.
The story follows a few people, switching perspectives frequently, but not so much that it's confusing or troublesome. The plot is enthralling and it's hard not to care about the fate of the characters which not only occupy Old Haven (the city below) but those few you become attached to in New Haven (the city above).
It is actually rather difficult to sum up this book in a few lines. The Citizens, on the surface city of New Haven, think they have a perfect life but as an outsider you realize it's all smoke and mirrors. There is no freedom, they just live in a pretty cage. For those that live underneath, they make their own choices and have absolute control over their decisions, but the choices they have are rather meager. They face starvation and capture at every turn. Their world is complicated and dangerous and you cannot help but hope for them to see the sun again, no matter the cost.
The ending is an exciting but absolutely heartbreaking twist that has left me eagerly awaiting the sequel.