There is complete harmony in Svetlana's life: she has a wonderful family - a loving husband Anton and an adored son Denis. But unexpectedly Anton found out that Denis was not his own son. Sveta is shocked, because she has always been faithful to her husband... She tries to find out how this could happen and learns the terrifying truth - her child died in the maternity hospital, and the nurse, eager to help her poor parents, replaced him with Denis, whom his mother abandoned.