After the death of her father under very suspicious circumstances, Ellie Grimbridge and Dr Daniel Challis decide to investigate the shady activities of Conal Cochran, the owner of the Silver Shamrock Novelties company. Before long, they discover Cochran's diabolical plot to brainwash the children of America into doing his bidding through a mixture of ancient rituals, technology, and witchcraft. This Halloween, wearing the mask of a skeleton, a witch, or a pumpkin can be deadly. Can Ellie and Daniel thwart the plans of the evil toy-maker?