Denis Komarov works in the police. He is an expert in technical equipment, ace in his profession. Denis's wife Natalia is a physical education teacher at the school. The ordinary life of a family with little wealth is destroyed by the terrible news – the only daughter, eight-year-old Olenka is seriously ill. Only an urgent and very expensive kidney transplant can save her. Desperate parents are ready for anything. They are ready to sell the apartment, but help suddenly comes from the other side. Denis's former classmate, with whom he never found common ground, influential businessman Mikhail Kapustin lends him the required amount. Self-confident and vain Michael at that time can not imagine that his own family will face no less terrible trials. And what exactly Denis will do everything possible to save his little daughter Nastya…