Troubletwisters / Nix, Garth

When their house mysteriously explodes and they are sent to live with an unknown relative named Grandma X, twelve-year-old twins Jaide and Jack Shield learn that they are troubletwisters, young Wardens just coming into their powers, who must protect humanity from The Evil trying to break into earth's dimension.

Twins Jaide and Jack Shield discover that their father and grandmother are "wardens," tasked with defending portals and humanity from evil, but their lives change forever when they learn that they share the same powers.