S6 Ep12: Above Suspicion: The FBI Informant Who Disappeared

A young mother from a tiny Kentucky hollow vanished without a trace in 1989, leaving behind her clothes, her makeup and her two children. She'd been working as an informant for FBI Agent Mark Putnam, so her family held onto one hope: Maybe she'd finally gotten the fresh start she'd always dreamed of through the federal witness protection program. It would take a year to find out the truth about what happened to Susan Daniels Smith. And it was worse than anyone had imagined.