Maggie Holt is used to such questions. Twenty-five years ago, she and her parents, Ewan and Jess, moved into Baneberry Hall, a rambling Victorian estate in the Vermont woods. They spent three weeks there before fleeing in the dead of night, an ordeal Ewan later recounted in a nonfiction book called House of Horrors. His tale of ghostly happenings and encounters with malevolent spirits became a worldwide phenomenon, rivaling The Amityville Horror in popularity—and skepticism.