en Cuevana 3. Denis Komarov is a policeman. He is an expert in technical equipment, a top specialist. His wife Natasha is a school coach. The ordinary family with a modest income leads a settled happy life until they get terrible news. Their only lovely child, the 8 year old Olya, is severely ill. Her last chance is a very expensive operation on kidney transplantation. The despaired parents are going to sell their apartments, but suddenly they get an alternative solution.