"The Bad Seed" is a psychological horror novel written by William March in 1954. It tells the story of Rhoda Penmark, a seemingly perfect young girl who is actually a sociopath. As her mother, Christine, uncovers the truth about Rhoda's dark nature, she grapples with the implications of her daughter's actions and the possibility of inherited evil. The novel explores themes of nature versus nurture, morality, and the fear of one's own offspring. It raises questions about the potential for evil within children and the responsibilities of parents in shaping their behavior. The story has been adapted into films and stage productions, further cementing its place in popular culture.