Famous writer Suzanne Collins, author of The Hunger Games, wrote a series about the amazing adventures of Gregor Terrestrial, creating an atmospheric and very memorable world. Gregor experienced many exciting adventures in the underground world, stretching for hundreds of kilometers under New York. He made friends with its strange inhabitants, fought with huge rats, made his way through the poisonous jungle and traveled on bats. But this time he is in for something special. Grand battles, ingenious riddles, the most ominous of prophecies and unexplored territories of the Underdark. Who will he meet there? What awaits him on his new journey? The most dangerous adventure is about to begin.