Teun works at Efteling theme park and is assigned to take care of Jamie, the daughter of park director Indra. When security guard Cor is attacked one night by a ghost with a flaming sword, Teun and Jamie become embroiled in a mystery. Who or what is this ghost, and what is it doing at Efteling?

During the annual family weekend in theme park "De Efteling", eleven-year-old Teun discovers that his recently deceased grandfather left him one last scavenger hunt inside the park.