 The story has since been described as an important example of horror fiction, influencing generations of later writers.A discussion between two men on the nature of evil leads one of them to reveal a mysterious Green Book he possesses.It is a young girl's diary, in which she describes in ingenuous, evocative prose her strange impressions of the countryside in which she lives as well as conversations with her nurse, who initiates her into a secret world of folklore and black magic.