After the death of her husband, Janet Milliken moved her two children from California to Pennsylvania to start over. Their new house, a colonial on a quiet street, seemed idyllic. But once they moved in, things started to go wrong: Odd sounds, strange sensations, whispers from the neighbors. Eventually, the Millikens discovered the dark history of the house. “The Ghosts of Pickering Trail,” by Will Hunt and Matt Wolfe, offers a gripping portrait of a family ravaged by grief and driven to the edge by experiences that defy explanation.