Any book / novel that tells you the plight, the history of the poor people, which is hardly ever in the history books.
This book is worth reading if not for the whole story, which is great in itself, at least for the paragraph where the main character, landless servant, is forced to compare herself with the daughter of the landless peasant who at least can afford to lease a farm, especially the bit about having to choose between the sexual advances of her master and being thrown out of the farm.