Watch Don't Hang Up! (1974) Official Trailer

After 13 years she returned home... To a house of terror.

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.