Shella

From the author of the acclaimed Burke private-eye series comes an ambitious and chilling novel that shows us not only what evil is, but where it comes from. For Shella is nothing less than a tour of evil's spawning ground, conducted by one of its natural predators. He is called "Ghost" because he is so nondescript as to be invisible and because he slays with such reflexive ease that he might be one of the dead.
Once he traveled with a woman who was called "Shella" -- because those who had treated her as a horrendously ill-used child had tried to make her come out of her shell. Now Shella has vanished in a wilderness of strip clubs and peep shows, and Ghost is looking for her, guided by a killer's instinct and the recognition that can only exist between two people who have been damaged past the point of no return.
The result is Andrew Vachss's most compelling work to date, the thriller reimagined as a bleak romance of the damned.