Lucifer has opened his doorway into the void now, and there's a fairly complicated plan where he retrieves his wings, avoids a battle with the heavenly host, and some other stuff. I read this for the "Demons" square for the Halloween bingo. Whether the devil counts as a demon may be debatable, but there are other demons in the story. I'm not sure if it would work for any other square. The children from the title are important to the story but I'm not sure whether they would count as main characters for "Chilling children". Maybe Elaine would.