Secret Files Tunguska

When Vladimir Kalenkow, a high-ranking scientist looking into the unexplained Tunguska catastrophe from 1908, goes missing, his daughter Nina and his assistant Max are drawn into a conspiracy of epic proportions. Chased across the globe by the Russian intelligence apparatus and a zealous secret society, the two adventurers solve mysteries in Germany, Russia, Cuba, China and even Antarctica. But the more light they shed on the truth, the more they put themselves in danger!