The tale of two sisters with the older one pledged to look after the younger one that transpires between a department store, NYC's Central Park and a boarding house. THe older one is the sweet, old-fashioned type and the younger is a jazz-age flapper who takes whatever falls her way. Mame, the older, goes on vacation and returns home to find that her kid sister, Janie, has vamped her way into the arms of Mame's intended.