A young woman assumes the identity of a deceased granddaughter to comfort a sick grandmother who is unaware of her real granddaughter’s death, believing she has merely gone away. The family, noticing the young woman’s striking resemblance to the deceased, enlists her to spend time with the grandmother during her final days, pretending to be her granddaughter to bring joy to her upcoming birthday. However, the young woman begins to experience terrifying visions of the deceased granddaughter, and her life is put at risk when the family unexpectedly plots to murder her. As she finds herself in peril, she embarks on a quest to uncover the truth about the deceased girl, all while gradually losing her grip on reality as hallucinations and reality blur together.