In 1920s Louisiana, a wealthy man's mysterious death at a remote plantation draws two investigators into a nightmare of supernatural horror. Players alternate between Edward Carnby, a hardened detective, and Emily Hartwood, the deceased's determined relative, as they probe the circumstances surrounding Jeremy Hartwood's apparent suicide at Derceto Manor—an isolated estate nestled deep within the bayou and whispered to harbor dark, otherworldly forces. What begins as an inquiry into a tragic death quickly spirals into something far more sinister, forcing both protagonists to confront the mansion's malevolent secrets and the supernatural evil that may have driven Jeremy to his doom.