Nina Kalenkov is torn from her day-to-day routine when she finds out her father has disappeared without a trace. As the police cannot help her - or do not want to?! - , Nina sets off to look for clues about her father's whereabouts. She thereby meets Max Gruber, a young colleague of her father who spontaneously offers to help the attractive young lady and the two quickly find out that Nina's father had something to do with an expedition to the Tunguska site in Siberia. Nina and Max soon realize that the events back then must have something to do with her father's vanishing. The search leads Nina and Max to some of the most remote corners of the world, e.g. Moscow, Cuba, China and the Antarctic. It soon becomes clear powerful adversaries are also interested in her father's secret and that there is much more at stake than just the disappearance of an old man.