A distraught young mother pounded on the door of a stranger's house and told a story that riveted the nation: She'd been carjacked while driving an empty stretch of road, and the man who'd held her at gunpoint took not only her car, but her two young sons strapped into the car seats. As Susan Smith publicly pleaded for her boys to be returned unharmed, she hid a terrible secret that would shock the country and horrify her family.