Two American tourists on a romantic camping trip are brutally murdered. A few days later, during the ancient festival of Samhain, a group of American university students moves into a beautiful cottage, surrounded by a lush forest and a majestic lake. They are there to learn about the rituals of the ancient Druids and other Celtic legends. But in the remains of an abandoned copper mine, lives the ancestors of an incestuous clan of cannibals. Stalked by hulking, disfigured mutants, the students and their chaperone are in the the most harrowing time of their young lives. And keeping their heads on their necks will become their main concern.