In a certain New England town, it's hard to keep the undead down. It's shocking story continues courtesy of Larry Cohen, a maestro of cinematic horror (the It's Alive trilogy) and writer of police-action thrillers (Best Seller, Maniac Cop), tapping into his senses of the macabre as well as satire in a clever chiller based on characters created by Stephen King. Joining in to bedevil and terrify are Michael Moriarty as an anthropologist a