Nadya Klyueva, a very nice employee of one research institute cannot arrange her personal life. She is more than thirty years old, yet still unmarried. She occasionally meets her former schoolmate Susanna in a bus. After that Nadya's life begins to change. Susanna is a professional sociologist and gives Nadya practical advice on how to change her behavior and clothing to get married successfully. The object of Nadya's courtship is her colleague Volodya, frivolous "Don Juan". But soon Nadya realizes that her happiness and love that she sought through a variety of tricks and efforts is just nearby ...