12 jurors must decide whether an 18-year-old boy accused of murdering his stepfather, a Russian army officer who fought in Chechnya, is guilty. All the evidence points against the accused, and eleven of the twelve people gathered in the school gym are ready to convict the young man. But one of the jurors is sure that everything is not as clear as it seems at first glance, and suggests a more thoughtful consideration of the case.