Carla Nowak (Leonie Benesch) is a new arrival on the staff of a middle school in Germany, her commitment and optimism still unblunted. When the suspicion for a spate of thefts falls on a particular boy, based on little more than his skin colour, she acts to exonerate him, capturing, through dubious means, evidence that seems to implicate a fellow member of staff. But the accused teacher, single mother of Oskar (Leo Stettnisch), another child in Carla’s class, doggedly protests her innocence.