According to The Nice and Accurate Prophecies of Agnes Nutter, Witch (the world's only completely accurate book of prophecies, written in before she exploded), the world will end on a Saturday. Next Saturday, in fact. Just before dinner.
(Grades 10 and up) Violet and Luke feel mostly alone in their large house by the sea, so they rent the guesthouse to River West. When stranger and stranger things start to happen, Violet begins to wonder if River has a bit of evil to him.