Hunter By Intent - An Addison Hunter Novel, #4

Addison Hunter thought it was all over this time. The Ghost managed to get to her again and she is left shattered and broken. When she discovers just how close he is, she knows its time to change tactics if she has any chance of bringing him down. But he's cleverer than any serial killer she's ever come across before and he always seems to have the upper hand. He continually tests her, prodding her to work with him rather than against him.
She isn't the only one trying to shut down the baby trafficking business. Just when she thinks there's no way to save the last of the pregnant girls, Brody comes up with news that makes her step over the line she's sworn never to cross. And this time it isn't her life on the line - she takes in a civilian as bait. As she closes down that side of the business, a new twist makes her second guess her place in the world.