The detective spread out the photographs on the kitchen table, in front of Nicole, on a December morning in 2006. She was 17, but in the pictures, she saw the face of her 10-year-old self, a half-grown girl wearing make-up. The bodies in the images were broken up by pixelation, but Nicole could see the outline of her father, forcing himself on her. Her mother, sitting next to her, burst into sobs. 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. Nicole's parents split up when she was a toddler, and she grew up living with her mother and stepfather and visiting her father, a former policeman, every other weekend at his apartment in a suburban town in the Pacific Northwest. He started forcing her to perform oral sex and raping her, dressing her in tight clothes and sometimes binding her with ropes. When she turned 12, she told him to stop, but he used threats and intimidation to continue the abuse for about a year. He said that if she told anyone what he'd done, everyone would hate her for letting him. He said that her mother would no longer love her.