Max and Marinka loved to walk in this park from early childhood. And they did not know that for a long time an ominous curse had hung over its centuries-old trees. Hidden in the depths of the park are the ruins of a palace, the owner of which was known as an alchemist and warlock. Strange things begin to happen there - dogs that are being walked along the alleys go berserk and break from their leashes; horror seizes people, forcing them to tremble and flee. There is clearly some evil spirit involved here... So Max and Marishka are drawn to get into the dungeon of the ruined palace and find out what is hidden in its dark labyrinth...