Crook Willem makes his twin sons (one bald) switch places to 'demonstrate' his fake 'miraculous' hair growing potion. It sells well, even to granny and the commissioner's mother for their balding men. In fact it's poisonous fertilizer solution, which instantly causes an ugly rash. The commissioner, who cares only for an impending 'best police commander' jury inspection, blames granny's biscuits, so all confiscated along with the sweets.
—KGF Vissers