Scientists say that the paternal instinct does not exist in nature. But the twists of human destiny proves that biologists are wrong. Andrey Perevalov lives predictably: he works in the housing Department and is preparing to become a father. One day, his pregnant wife goes to visit a friend and gets into a car accident. An obstetrician in the city maternity hospital Olga Mikhailova performs a complex operation and saves the baby, but the mother, unfortunately, does not survive. At the same time, everyone thinks that both parents died, since the driver is mistaken for Vera's husband. At the same time, the child of a drug addict dies in the hospital. But by mistake of a careless nurse, the deceased is appointed the son of the deceased Faith…