
Silver Shamrock, a mass producer of Halloween masks, plan to kill millions of innocent children worldwide by placing pieces of Stonehenge rock into small tags and attaching them to the masks. When children all over the world sit down to watch the Silver Shamrock advert, terror and panic will spread. Dr. Dan Challis investigates into a series of bizarre and horrifying incidents which begin to unfold before Halloween evening, and comes face to face with the sinister figure of Conal Conhran, maker of the evil masks.