UnDivided (2014) is book 4 and the final book in the Unwind Dystology. If you are unfamiliar with the concept of Unwind, then be prepared for a very disturbing (yet irresistibly compelling) story line!
Recap: America agreed that life begins at conception; HOWEVER, if parents are not happy with the outcome of their children between the ages of 13-18, then they may have them “unwound” — meaning ALL of their body parts are harvested and used in other people so that technically the teens are still alive…just in other people!
Book 4 gives Unwind fans the end result we all desire, but not without some shocks — including the hero, Connor! Fortunately, Shusterman does not go totally Veronica Roth Allegiant on readers, but he definitely added some serious obstacles to achieve the satisfactory end result. Nelson, Roberta, Starkey…all reap what they have sown. (I took particular pleasure in what happened to Nelson.)
Due to the disturbing nature of this series, these books are recommended for high school and up.