The scientist Susan Carter is researching the rehabilitation of addicts using an experimental drug in her rehab center. After her death, her idle son Brian Carter is forced by his friend Simon to travel to the property that he had inherited. Brian and Simon travel with five other friends to the spot and they find that the center is actually an ancient monastery and they have to spend the night. Sooner they are murdered, one by one, by creepy creatures that live in the place.
