Ten year-old Caroline is overjoyed when she gets the chance to leave her boring summer in Montreal and travel to see her father on the set of his new movie in Austria. However her joy is short lived as problems on the set jeopardize the film's production. Concerned for the future of her father's career, Caroline smells sabotage and with the help of local boy Jakob, they decide to investigate the strange goings-on. Little do they know that their exploration will uncover a mystical truth that is almost as unbelievable as it is terrifying, and that spending a summer with the ghosts will be no vacation...