For nearly three and a half decades, the disappearance of 12-year-old Jonelle Matthews was a mystery – a riddle neither authorities nor her family members could solve. The residents of her cloistered Colorado hometown had scoured every inch of prairie. The President of the United States appealed to journalists to help. Jonelle’s smiling face was printed on milk cartons nationwide. Still, every lead had fizzled. Every person of interest had turned out to be a dead end...