Welcome to 1920's Britain, where cats and dogs have a voice and are treated as equals to humans. In the quaint village of Upper Much-Mousing, one lucky young cat named Erin Chumley inherits an old Manor house and Estate. But with it comes responsibility and bills, and Erin must navigate her new life with the help of her housekeeper and tutor, Mrs. Hudson, a retired Army veteran with a mysterious past.