A philandering dentist asks his assistant to help him deal with his latest girlfriend.

When middle-aged New York dentist Julian Winston breaks their date, his 21-year-old mistress, Toni Simmons, attempts suicide. She is rescued, however, by Igor Sullivan, an aspiring young author and her neighbor. Despite his bachelor status, Winston has told Toni that he is married and the father of three. Impressed by Toni's abortive attempt on her life, Winston considers marrying her. Knowing that she hates liars, the dentist fabricates a divorce from his nonexistent wife. In so doing he elicits the cooperation of his spinster assistant, Stephanie Dickinson, who, unbeknownst to the dentist, has loved him for 10 years. Stephanie plays the role of wife so well that Toni relents, and Winston realizes that his nurse is not only the perfect professional associate but the ideal mate.