1944年8月。苏联军事反间谍部门正试图确定敌方特工。该司令部怀疑敌人正在解放的领土上工作,敌人必须获得损害苏联政府的文件(苏军与德国人进行的秘密谈判),该文件仍留在希特勒前总部地牢的某个地方 August 1944. The Soviet Department of Military Counterespionage is trying to identify an enemy secret agent. Dramatic events unfold as it becomes clear that the spy is one of the Soviet army's own men.