Don't Hang Up!(1974)

movie - first aired/released 1974-05-03 - audience 6.1

13 years after witnessing her mother's murder by an unknown assailant, Amanda Post returns home to attend to her dying grandmother. When she dismisses the doctor, a local magistrate and an antique collector, all of whom seem to have their own sinister agendas, she becomes the target of anonymous threatening phone calls.