London, 1939. This is a miserable day for Pettigrew (Frances McDormand), at least it seems so at first. As the daughter of a pastor, she abides by strict and rigid self-discipline, and also applies these constraints and teachings to the children she brings up. Yes, Pettigrew is a tutor in London, but her strict discipline makes parents very dissatisfied, and she was fired three times within a month. This time, Ms. Holt from the tutoring center also kicked her out. Dressed in gray and old-fashioned, she was poor and picked up the professional recommendation letter for Miss Delysia Lafosse (Amy Adams) and went to her door. Delysia is a singer and actress who is waiting to shine. In order to fight for the opportunity, she is dealing with three men at the same time, and only one of them is her true love. Over the next 24 hours, Pettigrew will help Delysia survive the most dangerous and comic crises and discover what true happiness is, and Pettigrew also finds his own love.