The general plot revolves around an allegedly overpopulated world and the Government’s Procrustean attempts to arrest the symptoms of population growth and scarcity amongst the Earth's resources. In this turmoil, the democratic government has been overthrown and a totalitarian Government has been put in its place. Laws established by the regime prohibit a family from having more than two children (any more will be killed). Luke does not want this to happen.
taken from Wikipedia
I used Wikipedia's summary just in case many of you decide to read this series which I hope you do. The plot summary would be a major spoiler for the first book. This review is spoiler-free.
The series is 7 books long and in this second installement, there are twists and turns you won't believe. For a Middle Grade book, I am floored by how enthralling it is.The worldbuilding in this book is incredibly realistic. I can very easily imagine a world where families are forbidden to have a third child.
I strongly suggest that you read the first book so that you understand Luke's character. Otherwise, you will be extremely frustrated with him rather than sympathetic. There is some re-capping done that makes sure you won't be lost if you start reading from this book on, but you are better off starting from the beginning.
All in all I give Among the Impostors 4 out of 4 stars. Highly recommended for fans of Middle Grade fiction and the Dystopian genre.