Louisa Hilliard, the last descendant of one of Charleston's oldest families, finds her quiet life turned upside down when she comes upon the diary of one of her ancestors, which recounts the story of Diana, a 19th Century slave who worked for the Hilliards. As Louisa learns of Diana's tragic fate, she begins to sense a presence roaming in her house. Attempting to appease this presence and set right age-old wrongs, she discovers how her own life is entangled in her family's haunted history.