Roaming about the snow-bound familiar roads and houses of the city long after the last stray dogs have disappeared from them, he is surprised by wolves, reindeer, and polar bears, and therefore ponders if the roaring in the north may be caused by an expedition from North America across the frozen-over Atlantic or by efforts to free the land from ice and snow with atomic bombs. When he climbs to his usual look-out, on an especially clear day, he finally detects the real origin of the northern sound, catching sight of the glitter of a threatening mass of glacial ice that is relentlessly advancing towards him.
Walking aimlessly through the snow-covered streets and houses of the city, even after all stray animals have disappeared, he is surprised by wolves, reindeer, and polar bears, leading him to speculate about the possible causes of the loud noises in the north, including a potential expedition from North America across the frozen Atlantic or an attempt to melt the land with atomic bombs. As he climbs to his usual vantage point on a remarkably clear day, he finally discovers the actual source of the northern sound, spotting the glint of a massive glacier advancing towards him.