Best-selling author Lisa Gardner presents the case of 25-year-old South Berwick, ME resident Amy St. Laurent. After St. Laurent disappears, what follows is a vast, multi-jurisdictional effort, with unprecedented collaboration between law enforcement agencies. Over the course of their many tireless efforts, investigators are led through multiple suspects, conflicting stories and cover-ups, and eventually, to a dangerous sexual predator who may have been hiding in plain sight.