There are 4 books in the Unwind Dystology series. The newest book is UnDivided which came out in 2014.

1
Unwind

Book cover of Unwind
In a society where unwanted teens are salvaged for their body parts, three runaways fight the system that would "unwind" them

Connor's parents want to be rid of him because he's a troublemaker. Risa has no parents and is being unwound to cut orphanage costs. Lev's unwinding has been planned…
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2
UnWholly

Book cover of UnWholly
In a society where unwanted and troublesome teens are salvaged for their body parts, Connor, Risa and Lev continue to fight against the system that would 'unwind' them. Thanks to their high-profile revolt at the Happy Jack Harvest Camp, people can no longer turn a blind eye to unwinding.Ridding society…

3
UnSouled

Book cover of UnSouled
In the next part of Neal Shusterman's gripping and thought-provoking futuristic thriller, Connor, Lev and Risa continue to uncover shocking secrets about the process of 'Unwinding' and the company, Proactive Citizenry, which created Cam, a teen made completely from parts taken from 'unwound' teens. There are plans to mass produce…

4
UnDivided

Book cover of UnDivided
Proactive Citizenry, the company which created Cam from the parts of unwound teens, has a plan: to mass produce Rewound teens like Cam for military purposes. But below the surface is of that horror lies another shocking level of intrigue: Proactive Citizenry has been suppressing technology that could make unwinding…