Glenda Jackson gives a stunning performance as Maud, afflicted with dementia, in this BBC adaptation of the bestselling novel by Emma Healey. Maud is an elderly woman struggling with dementia who is trying to piece together what has happened to her best friend Elizabeth. After Elizabeth goes missing, Maud is convinced that something terrible has occurred, and she sets out to solve the mystery, all the while fighting against time as her dementia worsens. As Maud becomes more forgetful, the distinctions between past and present begin to blur  – and she begins to wonder whether the mystery is connected to the decades-old unsolved disappearance of her own sister, Sukey.