Fran Fine, a working class woman from Queens, has just been dumped by her boyfriend/boss. To make ends meet, she begins selling cosmetics door to door and ends up on the doorstep of rich widowed Broadway producer, Maxwell Sheffield, where she stumbles upon the opportunity to become the nanny for his three rambunctious children, Maggie, Brighton, and Grace. At the helm of the Sheffield household is Niles, the butler, who quickly sees that Fran is the best thing that has ever happened to the family, whether they realize it or not. With her eccentric boldness, off-beat nurturing and straightforward honesty, Fran becomes more than just the Nanny and finds herself a most unlikely member of the family.