Rivertown is haunted by ghosts. Three children-Oliver, Ryan, and Annie, along with Annie's mother Ophelia and a distant relative Merlin the Magnificent-form the Haunted House Club. They venture into the strange and quirky world called the fourth dimension to find a way to rid the town of the haunting spirits. Follow their quest as they encounter dangerous quick sand, fire-breathing toads, and giant spiders, among other strange creatures. Along their journey, they discover how resilient they are in the face of difficult challenges.