"The heat in Room 304 was suffocating. It was the kind of humid, sticky afternoon where patience wears thin and teenagers get restless. I’m Arthur Harrison, a history teacher counting down the days to retirement. I thought I had seen it all—the laziness, the disrespect, the obsession with phones. But I was wrong. I hadn’t seen anything yet. In the back of my class sat Leo Miller. He was the ghost of the school—always wearing a heavy coat, head down, invisible. While the other kids laughed and go