The Good Sister by Sally Hepworth

The novel revolves around the complex relationship between twin sisters Fern and Rose, who have navigated a challenging childhood marked by their mother's manipulative behavior. Fern, who is neurodivergent, relies heavily on Rose for support and guidance. As the story unfolds, Fern decides to help Rose by having a baby for her, leading to unexpected revelations and tensions. The narrative alternates between Fern's perspective and Rose's diary entries, gradually uncovering dark family secrets and exploring themes of trust, loyalty, and the fine line between protection and control.