"The Bad Seed" is a psychological thriller novel written by William March in 1954. The story revolves around Rhoda Penmark, a seemingly perfect young girl who harbors a dark secret: she is a sociopath responsible for the deaths of those who stand in her way. The narrative explores themes of nature versus nurture, as her mother, Christine, grapples with the realization of her daughter's malevolent tendencies. As the plot unfolds, Christine discovers the truth about Rhoda's actions and her own family's disturbing history. The novel raises questions about morality, evil, and the potential for darkness within individuals, making it a compelling read that has inspired adaptations in film and theater.