Riddles of the Underground Labyrinth

Finally, Marina Miracolo's dream has come true! She embarked on a journey on a real dirigible. The airship took her to the southern country of Afar - the cradle of civilization, renowned for its ancient structures. And it doesn't matter that life in the children's science camp seems unremarkable and uncomfortable at first: canvas tents, sleeping bags, daily exercise, boring quizzes…
Marina and her loyal friends Yan and Elfi have no doubt that their arch-enemy - the criminal Chimeras - is somewhere nearby. He will certainly want to penetrate the secrets of the Tower of Destiny - once the citadel of the Afar priests, and today just a tourist attraction. They need to try again to stop the villain who wants to subordinate the whole world to his power. For this, Marina, Yan, and Elfi just need to understand under what guise Chimeras is hiding this time.