Nina is torn from her normal life when she finds that her father has disappeared without a trace. The police cannot (or will not?) help her, so Nina begins searching for clues about her father's whereabouts on her own. In the course of her investigations, she meets Max Gruber, a young colleague of her father's, who spontaneously offers to help the pretty young woman. Together they soon find out that Nina's father was involved in a previous expedition to Siberia that set out to investigate what lay behind the mysterious Tunguska catastrophe...
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