The spectacular new middle-grade fantasy series from bestselling authors Garth Nix and Sean Williams.Are you a troubletwister?Jaide and Jack Shield have a secret. When they're unexpectedly sent to live with their mysterious Grandma X, they're thrust into a world where cats talk and strange weather comes out of nowhere. There they learn that they're troubletwisters, with powers they must use to stop the Evil from taking over our world. Before, they'd defeated the Evil through luck and intuition. Now though, Jaide and Jack will have to learn how to use their powers, and how to keep on their toes when evil forces return.