[The Young World} by [Chris Weitz] is a well written post apocalyptic story with a twist. All adults are die in a plague leaving the young to survive for themselves it becomes very much like [Lord of the Flies]. Also as the young people become a certain age they contract the plague that killed the adults. When they find that this plague was man made they fight to find the cure and save their friends and themselves.
This book was enjoyable and a quick read. It fits very well in a very popular YA genre.