Ever since Mackenzie's sister, Sabrina, died, she keeps having dreams that haunt her, that take her back to the moments before Sabrina's death. In her waking hours, she feels like crows are stalking her, and she begins to receive text messages from someone claiming to be Sabrina. Desperate for answers, Mackenzie returns home to a family still steeped in grief. And while she finds comfort with them, her dreams only seem to be getting worse...