The film tells about the execution in 1940 of 11 thousand Polish officers in the Katyn forest of the Smolensk region. Cross on the grave of Polish soldiers in the Katyn forest. Chronicle footage: members of a special commission investigating the case of Polish officers stand at the ditch with the bodies of the dead. Member of the Commission Academician N. N. Burdenko examines the corpses. The pathologist performs an autopsy. Polish film director A. Wajda talks about the tragedy in the Katyn Forest (simultaneous translation). Memorial service at the grave of the dead: the priest reads a prayer, the soldiers of the Soviet army bowed the banners. Chronicle footage: members of the commission are discussing at the table; among those present - the writer A. Tolstoy, academician N. N. Burdenko. NKVD veteran II Titkov gives interviews (synchronously). Military footage: fighting on the streets of Smolensk. Film director A. Wajda talks about his father, an officer of the Polish Army, who died in the Katyn Forest (simultaneous translation).