Ma and Pa Slocum sell up their thriving packed-lunch business (based on Ma's home cooking, Pa's packaging design, and pretty daughter Helen's salesmanship), and move 'uptown' to live the life of the idle rich on the proceeds. But Ma starts worrying about her figure, the neighbour's nephew has his roving eye on Helen, and her construction-worker fiancé feels that the family are getting too 'swell' for his touch; events culminate in a family quarrel that sends the men out to seek solace at a raunchy club, while the women resort to the Turkish Baths. But the night isn't over yet...