When Marie Morgan (Helen Parrish) was eight years old, she attended a banquet held by her dying grandfather, who disliked everyone in his family except her. That day he instructed her to return to his house upon her twenty-first birthday to read his will alone. Marie arrives at the house, and although it has been vacant for 13 years, the lights and telephone both appear to be working. Marie thinks back to the day her grandfather told her about his will and recalls the seating arrangement. There were twelve guests in attendance, but a thirteenth place to her grandfather's right was empty. Marie presently decides to open the envelope containing the will. Inside is a sheet of paper with the numbers 13-13-13 written with nothing else. Someone suddenly enters the house and a gunshot is heard, and Marie screams.