The first movie version, from the age of black & white, of Flemish (heimat-)author Ernest Claes' classical novel, titled after the nickname (Dutch 'the White', referring to a blond male) of the main character: a smart but naughty farmhand's son whose eternal mischief, pranks and disobedience drive his elders (especially teachers, family and father's grumpy employer, a rich farmer) and classmates to despair in a time when a boy's punishment was still inevitable, swift and often severe.
A local brass band rehearses for a music competition in Bruges. They are confident that a new march by a young music teacher will get them the first prize. Their chance of winning seems to get an awful lot smaller when a a fight breaks out between the chairman and the music teacher -- urging the latter to sell the march to another band.
Kamiel steals the famous Brussels statue of Manneken Pis to impress his girlfriend Denise, the daughter of the man who is supposed to guard it. The Belgians, however, wrongly accuse the Dutch of having stolen their statue and hit back by stealing the statue of Hansje Brink.