When in 1941 Nazi Germany invaded the Soviet Union, their troops quickly besieged Leningrad. Foreign journalists are evacuated but one of them, Kate Davies, is presumed dead and misses the plane. Alone in the city she is helped by Nina Tsvetnova a young and idealist police officer and together they will fight for their own survival and the survival of the people in the besieged Leningrad.

The film tells a story of an agent betrayed by his partner when transporting new psychic weapon. Believed to be dead, he escapes and takes new identity so he can live in peace far away. But later he is forced to return to Moscow to confront a secret organization, led by his former partner, that attempts to use the dangerous weapon in order to take control over the country. Now he is a key figure in the battle between forces of darkness and light.