My pitch for a new Horror Movie

This is my pitch for a Horror movie:

Ross and his pregant wife Jenny are driving through the mountains late one evening. They have been to a friends for a meal and are now making their way home. Depsite the fact the mountainous area was rumoured to have been a monsters lair many centuries ago, the locals were not afraid and stood their grounds.
As they are slowly driving through the tight, winding roads they come into a thick fog which makes visibility very poor. Jenny warily tells Ross that she feels an eerieness in the air and is scared for the edge of the mountain is very close but he reassures her. As they drive further on, the fog shows no sign of ceasing and the sheep which usually surround them are nowhere to be seen. Jennys overdue baby begins to kick repeatedly and she immediately knows that something is wrong although Ross insists she is just being silly.

All of a sudden their car comes to a halt without any explanation. Ross thinks he has hit the edge of the mountain and gets out to investigate. As he leaves the car and enters darkness, Jennys baby begins to put her in a lot of pain. As she fidgets in discomfort she hears a smack against the window. A disfigured hand rubs over the window and Jenny knows it is not the hand of her Husband. Before she has the chance to do anything, she feels the car is uneven and she fears what is about to happen.
The car goes toppling over the edge of the mountain and smashes after a long drop.

Ross's body was never found although Jennys was recovered just hours after the incident as sunlight began to break through. Jenny had given birth to her baby whilst she was fighting for her life after the drop. She had died after the birth of her son, who was found pale and cold.
When Jennys son reaches 18, he returns to the scene, without being told any information from anybody about what had happened to his parents. He had known what was going to happen before he was even born. Now he was back to investigate.