Two brothers of German heritage live in the Polish town of Poznan. Michal is the sensitive brother who likes literature, Andrzej is the daredevil with no intellectual bent, and between the two of them, they steal the German consul's Daimler-Benz limousine, on a lark. When they are caught by the police, the German consul unexpectedly forgives them their prank -- but in the meantime, the episode has put the brothers in touch with a Nazi underground group who want to prepare the way for the pending German invasion (set to occur within a matter of days). Andrej helps the group kill the German consul and then they blame the death on the Poles -- giving the Germans an excuse to cross the border. Not only the consul, but "artistic" types like Michal are also killed for the same reasons. After these murders, Michal realizes his brother is no better than the group he joined, and decides to set his own course in the face of the rising threat of invasion.