Winter, January 1945. It is cold and dark, and the German army is retreating from the Russian advance. Germans are fleeing the occupied territories in their thousands, in cars and carts and on foot. But in a rural East Prussian manor house, the wealthy von Globig family tries to seal itself off from the world. Peter von Globig is twelve, and feigns a cough to get out of his Hitler Youth duties, preferring to sledge behind the house and look at snowflakes through his microscope. His father Eberhard is stationed in Italy - a desk job safe from the front - and his bookish and musical mother Katharina has withdrawn into herself. Protected by their privileged lifestyle from the deprivation and chaos around them, and caught in the grip of indecision, they make no preparations to leave, until Katharina's decision to harbour a stranger for the night begins their undoing.