Twelve year old 'Boefje' spends most of his time in the alleys, on rooftops and in the harbor of Rotterdam. A local clergyman takes pity on him and attempts to teach him good manners.

Diary fragments tell of the arrival of Belgian refugees across the Dutch border in winter 1915. Reserve lieutenant Berkhage returns from the Belgian border with a refugee child. Named "Big" by the company the kid soon becomes the regimental darling.