This is a book that is aimed at a young adult readership, but it's one of those gems that can be picked up by an older reader and, because of the interesting concept and style of writing, can be enjoyed by them as well.
I found the central theme really refreshing - there are no vampires or supernatural creatures here, just humans living in a future society where immortality is valued above all, and having children a punishable offence. Anna is a Surplus - as in surplus to requirements - who was discovered by the authorities as a toddler and taken away from her parents. She believes that she isn't worthy of hopes or dreams, or a life of her own, and is instead content to lead a life of service without asking too many questions.
Then Peter comes along and changes everything. Soon Anna is left questioning her every belief and her world is turned upside down. A tense adventure follows, with a very dramatic climax - and I'm sure a sequel is soon to follow.
The plot is cleverly written, the characters believeable - especially Anna's - and, although I found the ending rather a little too neat and couldn't work out for the life of me how certain parts of it were planned in advance by certain characters, I enjoyed it.
To anyone who's a fan of Divergent by Veronica Roth, The Hunger Games series or Richelle Meade's Vampire Academy series, this is a must read.