The detective spoke gently, but he had brutal news: the pictures had been downloaded onto thousands of computers via file-sharing services around the world. They were among the most widely circulated child pornography on the Internet. Also online were video clips, similarly notorious, in which Nicole spoke words her father had scripted for her, sometimes at the behest of other men. For years, investigators in the United States, Canada and Europe had been trying to identify the girl in the images.