Spring, 1924. Mother’s Day. Jane (Odessa Young), abandoned as a child, is a housemaid to the grieving Niven family (Colin Firth, Olivia Colman). She’s also entangled in a love affair with Paul (Josh O’Connor), the son of a neighbouring wealthy couple who’s engaged to another woman.
Their affair plays out in secret, but over the course of the day, shocking events are set into motion that change the course of Jane’s life forever.