Darkness, my old friend : a novel / Lisa Unger.

Enhanced descriptions from Syndetics:

The New York Times bestselling author of Beautiful Lies and Fragile returns to The Hollows, delivering a thriller that explores matters of faith, memory, and sacrifice.
 
After giving up his post at the Hollows Police Department, Jones Cooper is at loose ends. He is having trouble facing a horrible event from his past and finding a second act. He's in therapy. Then, on a brisk October morning, he has a visitor. Eloise Montgomery, the psychic who plays a key role in Fragile, comes to him with predictions about his future, some of them dire.

Michael Holt, a young man who grew up in The Hollows, has returned looking for answers about his mother, who went missing many years earlier. He has hired local PI Ray Muldune and psychic Eloise Montgomery to help him solve the mystery that has haunted him. What he finds might be his undoing.

Fifteen-year-old Willow Graves is exiled to The Hollows from Manhattan when six months earlier she moved to the quiet town with her novelist mother after a bitter divorce.  Willow is acting out, spending time with kids that bring out the worst in her. And when things get hard, she has a tendency to run away--a predilection that might lead her to dark places.

Set in The Hollows, the backdrop for Fragile, this is the riveting story of lives set on a collision course with devastating consequences. The result is Lisa Unger's most compelling fiction to date.