Anna Akulova is a single mother and a college algebra and geometry teacher. They fear her, admire her, respect her, but shun her. And only senior student Sashka Dronov is secretly and unrequitedly in love with a young teacher. But he knows that he has no chance... And now a new caretaker appears at the college, retired officer Dmitry Klyuev. Soon the college begins to notice that Dmitry is not indifferent to Anna and - oh, miracle - the impregnable proud woman reciprocates his feelings. Anna is happy with Klyuev and is ready to introduce him to her little daughter, when suddenly a terrible tragedy happens...