Mary Ellen brings her children on the boat to Sabines Island. Through the binoculars, she is stunned to see the orange Mustang in her beach house driveway. Her husband Tony is alone painting the house and the car belongs to a twenty-three-year-old provocative woman, Su Lee. Kel, a retired police officer helps her investigate the mischief. Su Lee’s presence to three deaths and then a fourth, prompts Kel to unravel her background. Mary Ellen finds herself alone in the beach house to face a possible killer as she fights for her own life.
Mattie Summers is caught in the throes of an abusive marriage. A gentle, sensitive soul, Mattie separates from her husband John after physical and emotional turmoil. She retreats to Maine on vacation, exchanging her Arizona home for a 19th century house on rocky cliffs overlooking the Atlantic. Alone and five miles from the town of Rexford, Mattie is harassed by eerie phone calls on the old rotary dial phone. McCabe, owner and manager of many local properties, helps Mattie with her broken down rental car and with problems around the Exchange House. McCabe takes Mattie out on a date but she finds evidence that her estranged husband is in the area. A pony-tailed and weird mechanic stalks her. As a fierce storm hits the area, someone on the property cuts the phone wires and Mattie is forced to flee for her life. Not until the final moments with her life in the balance does the identity of the assailant become evident.