Grace Brown is 11 and lives in West London with her parents and little sister Molly. Her parents are extremely Ordinary.
Liking to investigate the world with her microscope, Grace is different. She is interested in animals and plants and makes close observations of the people around her.
When her parents begin to behave strangely, what calls (to herself) The Big Parental Change, it has terrible consequences. Grace realises they have been brainwashed by the sinister Mrs Bland.
Grace discovers hidden strengths as she begins to stand up to the evil that is spreading throughout the land, helped by her new friends — the perfectly Normal skeleton men, ghouls, and talkative animals of Yawngrave Tower.