While on a tour of the brand-new firehouse with his friends, Graveyard Gruber feels an urgent tug from an invisible hand. Stories of a vacant house burned to the ground on the very same site, suspicions of arson, and a strange boy seen running from the blaze add to the mystery. Can an unexpected classmate provide the missing clue? Graveyard Gruber eagerly agrees to help out at the firehouse, determined to solve the mystery and set the record straight.