Edna (Robyn Nevin) has been living alone despite her old age. One day, her daughter Kay (Emily Mortimer) and granddaughter Sam (Bella Heathcote) received a call from the police, informing them of Edna's disappearance. Shocked, the two hurried back to the ancestral home. Not long after the search began, Edna appeared again. Edna didn't mention anything about her experience in the past few days of disappearance, and everyone could only explain it all by saying that she had Alzheimer's disease. Edna's return made everyone feel relieved, but who knew that the tragedy had just begun. After returning home, Edna changed her previous temperament, as if she had become a different person. Sometimes her actions even frightened Kay and Sam.