Subjected to abuse in assorted foster homes, Susan Heller (Andrea Roth) has waited a lifetime to punish her birth mother for giving her up for adoption. With only her talking doll Cheryl for company, deranged but comely Susan embarks on her deadly quest. First, pretending to have a car crash near the Conner Ranch, Susan worms her way into the confidence of the family's inner circle. Having already slain the Conner's horse trainer in order to provide a job opportunity for herself, Susan moves onto the property. Proving indispensable, she nurses neurasthenic Maggie Conner (Cindy Pickett), befriends her developmentally challenged son Buddy (Jaimz Woolvett), charms Maggi...