Professor Mark Stine has been running for his life ever since he arrived in England. On the island of Skara Farne, the venomous ghost of Abbot Thomas Beauclerc is back and out for blood. Though Mark has moved to Cambridge, the nightmares have returned and his girlfriend, Sue, is concerned. Mark knows the war isn't over; it's just beginning! Both officers, Jo Garland and Masson have their hands full with a slew of deadly assaults happening in the city. Each victim is missing a vital organ - eyes from one, kidney from another and the gruesome list goes on. Witnesses report seeing a grotesque monster who appears and disappears like mist. Jo wonders if the monster, now dubbed the Mutilator, is really the Follower - a formless, invisible member of the Abbot's unholy killing machine! All Hallows' Eve approaches and the bodies keep adding up. Mark, Sue, Jo and Masson race against time to stop the Abbot and his grisly henchmen. Mark soon learns he's only one part of the Abbot's plan. This time, the evil is more insidious and the Abbot is more aggressive. When Mark discovers what the last grisly piece of the puzzle is, he goes after the Abbot with a vengeance, never realizing that in destroying the Abbot, he could destroy himself.