After a childhood prank by his brother Angus causes Henry to develop a phobia of sheep, he must step up to the onslaught of a genetically-mutated man-eating flock with the help of his friend and a young environmentalist.

When a terrified family flees a desolate southern New Zealand farmhouse, two cynical scientists and a young psychic are sent to investigate their claims of a haunting. There they encounter a powerful spirit that will protect the house's secrets at all costs.