'Thoroughly modern Millie' is the story of an innocent country girl who comes to the big city in search of a husband. Along the way she becomes the secretary of the rich and famous Trevor Graydon, befriends the sweet Miss Dorothy, fights off white slaver Mrs. Meers and hooks up with a lively paper clip salesman, Jimmy. In the end it takes a rich and nutty jazz baby like Muzzy to unravel all these complications, give a great party, and match up lovers.