Crazy unique concept, I loved it! Parents aren't allowed to have abortions; children are protected from conception to the age of 13. Between 13 and 18 parents can "unwind" their kids, letting all the parts go towards medical implants and grafts. Instead of advancing medicine or curing cancer they just replace bad body parts with unwind ones. When Conner accidentally finds out that his parents have filled out the paperwork for him to unwind he goes on the run and encounters other misfit unwinds trying to stay alive like himself. It really makes you question a lot and it is surprisingly deep for a teen novel.