A former heavy-metal star tries to keep his past a secret from his family and friends while he rehearses for a reunion concert.

Eccentric Frank Carlyle ran a horror shop in small-town Steeple Falls, which takes pride in and profit from its Halloween traditions. Frank's widower grandson Richard grudgingly returns there from Boston with his own kids, bright Ian and bratty Claire, to settle the inheritance. Ian discovers great-grandpa's house is really haunted, and not just, as legend holds, by historic owner Zachariah Kull, who was burned on the stake.

A boy is the only member of his family without superpowers, yet the world depends on him saving his family from computerized brainwashers. Will he realize that it doesn't take superpowers to be a hero in time to help them defeat the villains?