By Brandilyn Collins. Per Goodreads, "Recounts the story of the Moore family, whose eldest daughter, Serena, confessed in her diary to killing her four-year-old sister, Mallory, and describes the ensuing trial that revealed the family's history of abuse and neglect."
Some staining and page toning to this paperback, and a merrily cracked spine, plus a Kmart sticker on the back, but it'll get the job done.