Art and Marsha Parker finally have a chance to get away for a week from Marsha's medical clinic in the small town of Bearford to visit a plush resort for a honeymoon, a gift from their wealthy benefactor, Charles Drummond. Somehow their adopted sixteen-year-old daughter, Mary Ann Markham, who is also Drummond's granddaughter, and Mary Ann's best friend, Jennifer Martin, manage to convince the old man that Art and Marsha need chaperoning, so the two girls show up at the resort at the end of the first week, ostensibly to notify Art and Marsha that they've been booked for another week but really...

A beautiful mid-autumn day, just the day for a Sunday drive in the country. At least that's what former journalist Art Parker; his wife, Dr. Marsha Parker; their sixteen-year-old adopted daughter, Mary Ann Markham; and her best friend, Jennifer Martin, think when they visit a hilltop in the western part of Mercer County that contains a Christmas tree farm; an old, apparently abandoned mansion; and... a corpse. If that isn't bad enough, after reporting the corpse to Jennifer's uncle, Sheriff's Deputy J.J. McClure, the girls decide they want to disregard the "No Trespassing" sign and explore...