London 1938. Dowdy middle aged governess Miss Pettigrew finds herself on the bread line after being dismissed from her latest job. Desperate for employment, she shows up at the posh flat of Delysia Lafosse, a glamorous and overly amorous nightclub singer who immediately calls upon the stunned Pettigrew to help her juggle her numerous suitors. Finding herself catapulted into the glamorous world and dizzying social whirl of London's high society every dream that she had given up on becomes reality - reminding all of us that everyone has a second chance to blossom in this world, even if only for a day.