"The Old Willis Place" is a children's novel written by Mary Downing Hahn. It tells the story of a young girl named Diana who lives in a mysterious, abandoned house with her brother, Gus. The siblings are not allowed to leave the property, and they have to keep their existence a secret from the outside world. As the story unfolds, Diana discovers the haunting history of the house and its previous inhabitants. The novel explores themes of friendship, family, and the consequences of secrets, making it an engaging read for young audiences who enjoy a touch of the supernatural.