Stach is a wayward teen living in squalor on the outskirts of Nazi-occupied Warsaw. Guided by an avuncular Communist organizer, he is introduced to the underground resistance—and to the beautiful Dorota. Soon he is engaged in dangerous efforts to fight oppression and indignity.

During the last few days of the Warsaw Uprising following World War II, a modest group of Resistance members remains. The band must take refuge in the sewers under the orders of leader Zadra, but it's only a matter of time before they will have to emerge. However, when they try, they are met only with intense hostility from the Nazis. Despite their attempts stay resolute through immense mental strain, it becomes increasingly apparent that they may be doomed.

A young academy soldier, Maciek Chelmicki, is ordered to shoot the secretary of the KW PPR. A coincidence causes him to kill someone else. Meeting face to face with his victim, he gets a shock. He faces the necessity of repeating the assassination. He meets Krystyna, a girl working as a barmaid in the restaurant of the "Monopol" hotel. His affection for her makes him even more aware of the senselessness of killing at the end of the war. Loyalty to the oath he took, and thus the obligation to obey the order, tips the scales.