The Edge of Normal by Carla Norton

Reeve has changed her name and tried to make a new life for herself in San Francisco, but the trauma of being held prisoner for years when she was a teenager remains.  When Dr. Lerner, her therapist, asks Reeve to help Tilly (a girl who recently was found after being imprisoned), she readily agrees, because a woman in similar circumstances aided Reeve tremendously after she was freed. Travelling to Tilly's hometown, Reeve becomes immersed in Tilly's life and the quest to find her kidnapper.  What Reeve, Tilly, and the authorities don't know is that the perpetrator is not in hiding, but part of the investigation, and is secretly listening in on them and and tracking their every move.  He still has two other girls in captivity and is not afraid to resort to violence to keep the secret. The Edge of Normal is a taut suspense novel that delves sympathetically into the mindset of survivors of extreme abuse.  Give to readers who enjoyed Rage Against the Dying by Becky Masterman and James Patterson's Alex Cross novels.  It will be published next month.