The story: 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 of 1908. At the time a huge explosion triggered an inferno, and the reasons behind that remain a mystery to this day.
Nina and Max soon realise that events of that time are linked to her father's disappearance. Their search for answers leads Nina and Max to the most distant corners of the earth (Berlin, Moscow, Cuba, China, Antarctica etc.). Soon it becomes very obvious that some mighty opponents are also interested in the secret of Nina's father. In the end it turns out that this is about much more than just the disappearance of an old man.