Nina is torn from her day-to-day routine when she discovers that her father has disappeared without a trace. As the police seem reluctant to help her, Nina sets off to look for clues relating to her father's whereabouts. She joins efforts with Max Gruber, a young colleague of her father who impulsively offers to help the attractive young lady. Together, they quickly determine that Nina's father was involved with a research expedition to Siberia in an attempt to reveal the causes of the mysterious Tunguska catastrophe of 1908. In that mysterious event, a mighty explosion triggered an inferno that decimated the land of Tunguska.