Unravel one of the greatest mysteries of our time. 1908, Siberia, Tunguska, region: A massive explosion of unknown origin triggers a flaming inferno and leaves death and destruction in its wake. Almost 100 years later, this mysterious catastrophe is barely remembered. Even Nina Kalenkow knows nothing of it - until her scientist father suddenly vanishes without a trace. Accompany Nina and her boyfriend Max on a fascinating voyage of adventure all around the world. Follow the trace of the kidnappers through ancient secret passageways in Irish castle ruins, through the flickering heat of Cuba and aboard the legendary Tran-Siberian Railroad. You will soon find there is more at stake than a single human life.