The third thrilling installment of the middle-grade fantasy series from bestselling authors Garth Nix and Sean Williams. When an old man in an even older house dies mysteriously, twins Jack and Jaide Shield find themselves drawn into a dangerous treasure hunt in some deep, dark places. Jack and Jaide are troubletwisters -- gifted with magic and cursed by The Evil, a force that will stop at nothing to destroy their world. The old house holds...