A very little known science fiction book series written by Neal Shusterman. Unwind is set in a world where children can be retrospectively aborted by their parents between the ages of 13 and 18. The series has a very small, very dedicated fanbase.
Person 1: What are you reading?
Person 2: Unwind.
Person 1: What's that?
Person 2: Best book ever! You should check it out.