unravels a decades-long mystery of The Monster of Green Hollow, a rumored serial killer believed to have murdered dozens of women including three of his wives, deaths once ruled as suicides. When one of his now adult-aged children breaks her silence and comes forward saying she was forced to help bury bodies on their property, their family begins to fracture as a three-year investigation by filmmakers unearths the secrets buried within a family - and in the hills of Green Hollow.