Practical demonology

"There have always been castles in the valley, and the people have always been under threat. They've always needed those thick walls, the protection of that enclosing stone. Non feels like she needs it more than most, because her mother was infected by the demons that live in the woods. As the doctor's daughter, Non had planned a career in medicine--partly to please her father, but also because it would keep her inside the protective walls of the...