Unravel one of the greatest mysteries of our time! What could link the massive, unexplained Tunguska explosion of 1908 with the disappearance of Nina Kalenkov's father 100 years later?As Nina, you and your friend Max will discover hidden passageways in abandoned Irish castles, experience intrigue in the sweltering heat of Castro's Cuba and journey on the Trans-Siberian railroad as you try to find your father. More than one life is at stake in this mysterious adventure.