Story of a Russian intelligence officer Nikolai Kuznetsov (known as lieutenant Paul Wilhelm Zibert) who worked in the capital of occupied by fascist troops Ukraine. 960 days and nights were left until the end of the Second World War.
Wartime, summer 1941. Train carrying criminals gets under enemy fire and crashed. Out of all of the living are only a young lieutenant of the NKVD and two prisoners - the thief and repressed Communist party worker.
Four young people from the former GDR want to start doing meaningful things. In spite of adverse circumstances they start the construction of an environmentally friendly solar power plant.