It depicts a crime scene — the exhumation of bodies and personal belongings found with the remains of Polish officers in a mass grave in the Katyn Forest, murdered in 1940 by the Soviet NKVD political police. The film also shows members of the International Medical Commission established by the German authorities, journalists, former Polish Prime Minister Leon Kozłowski (1934–1935), and Russian peasant Parfien Kiselev, one of the witnesses to
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