Pamela Paterson and Bettina Fraser call their crafting group Knit and Nibble, in honor of its two main activities. But on a stormy Halloween night, their peaceful chat over spiced cider and cookies is interrupted by homicide . . . With the houses of Arborville, New Jersey, decked out in festively frightening decorations, it's easy to mistake a real dead body for a fake. But Pamela and Bettina are alerted by the screams of teenage...