When You See Me by Lisa Gardner

When You See Me is part of a series starring Boston police sargent DD Warren, FBI agent Kimberly Quince and kidnapping survivor Flora Dane. The three women, along with Flora's friend, computer expert Keith, head to Georgia to investigate female remains found in the woods by hikers. But those remains open a whole can of worms in the small town where the investigation is centered and soon more remains are found--and new dead bodies start piling up as someone is desperately trying to keep a secret from being discovered. It's a dark, disturbing story with an action-packed ending.