Every child is safe until their 13th birthday. Then parents have the option of 'unwinding'--cutting their child into pieces and giving them to others. Once they turn 18, that's no longer an option.
Connor's parents decide to unwind him when he's 15. Risa's a ward of the state that no longer has the funds to support unnecessary talent. Lev is a tithe--born for the purpose of unwinding. All three are thrown together when Connor decides to break for it and kidnaps Lev to avoid getting shot with tranquilizers.
Connor and Risa end up at a sanctuary for unwinds, until things go terribly wrong.
And Lev, well, he makes some uncomfortable decisions.
An unusual concept and telling. The book focuses on different characters--most often Connor, Risa, and Lev, but it is told in 3rd person. The society is always in the background, and those who are unwound still have a voice throughout. Science fiction thriller to be sure!