Some of her books focus on spine-chilling or supernatural events, including The Windscreen Weepers (stories, 1969), The Shadow Guests (novel, 1980), A Whisper in the Night (stories, 1982), and A Creepy Company (stories, 1993, with variant contents in its US and UK editions). She set her adult supernatural novel, The Haunting of Lamb House, at Lamb House in Rye (now a National Trust property). This ghost story recounts in fictional form an alleged haunting experienced by two former residents of the house, Henry James and E. F. Benson, both of whom also wrote ghost stories.