In the piano-making town of Grand, Pennsylvania, Janice Pasetti keeps house for factory owner Harris Weldon, his newlywed niece and her husband, while raising her teenage daughter.

Sultry college dropout Annie Burroughs moves in with her older sister Marsha and proceeds to break up the relationship between Marsha and her live-in boyfriend David Mitchell so Annie can begin a sensuous love affair and have David all for herself.