In 1920s London, Gwen Farrar and Norah Blaney have an on and off stage partnership, singing popular love songs of the day to each other in West End revues and living together openly. At the same time Ella Shields music hall act is in decline. All the Nice Girls imagines her reaction to the younger pair as they live the starry life of bright young things. Does she envy their sexual freedom? Will their relationship survive the pressures of the age and the conflicting urges to marry and conform or to party wildly into oblivion?