The mystery

Jaide and Jack learn that their father and grandmother are "wardens," defending portals and humanity from evil, and their lives change when they learn they share the same powers. The plot contains violence. The coauthor is Sean Williams. Book #1

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.