Secret Files: Tunguska's story starts with a puzzle. When scientist Vladimir Kalenkow vanishes into thin air, his daughter Nina's world is turned upside down. She decides to investigate her father's strange disappearance. On her quest, Nina meets Max Gruber, one of her father's colleagues, who instantly offers his services to help.

Nina and Max follow a lead to a mysterious disaster zone in the Tunguska region of Siberia which Vladimir Kalenkow had been studying. In 1908, Tunguska was dev ... more >>

Secret Files: Tunguska's story starts with a puzzle. When scientist Vladimir Kalenkow vanishes into thin air, his daughter Nina's world is turned upside down. She decides to investigate her father's strange disappearance. On her quest, Nina meets Max Gruber, one of her father's colleagues, who instantly offers his services to help.

Nina and Max follow a lead to a mysterious disaster zone in the Tunguska region of Siberia which Vladimir Kalenkow had been studying. In 1908, Tunguska was devastated by massive powers, but until now, nobody knows exactly what. Does the disappearance of Nina's father have something to do with his previous expeditions to Siberia? The search for answers leads them to Berlin, then on to the freezing Antarctic. However, it soon becomes apparent that there are other people interested in Vladimir's secrets and that there is much more going on than the simple disappearance of an scientist. << less