The fourth installment of the thrilling middle-grade fantasy series from bestselling authors Garth Nix and Sean Williams.Jack and Jaide Shield have defended themselves against The Evil before -- but it's never been as dangerous as this. It isn't just the town of Portland that's threatened, it's the whole Earth . . . and certain dimensions beyond. The Wardens have devised a plan to get rid of The Evil once and for all. The only problem is that...