The Empty House — Algernon Blackwood

Aunt Julia, an elderly spinster with a mania for psychical research, has the keys to the haunted house on the square. She invites her nephew to accompany her on a midnight investigation into what really happened a hundred years ago when a servant girl fell to her death. But the house may not be as empty as it seems . . .

Algernon Henry Blackwood was a prolific English writer, most famous for his ghost stories.