Teenage siblings Ian and Claire Carlyle travel to Steeple Falls for the funeral of their beloved Grandpa Frank. As the small town prepares for its Halloween Festival, marking the legend of Zachariah Kull, Ian and Claire are startled to discover that ghosts really do exist! Worse, they learn that the angry spirit of Zachariah Kull won't allow their late grandfather's soul to rest. The siblings get some supernatural help from a trio of bumbling, yet well-meaning spirits called the Scream Team to help save their grandfather's spirit!