16-year-old Maya lives with her grandmother and doesn't want to grow up. Maya doesn't even know about the existence of the Underworld, until one day a gang of poison-tongued underground gangsters invade her life, turning everything upside down. Now Maya has to go down to the capital of the Underworld Nizhneburg, learn about the nine secret rooms of the Cloud Factory, go into exile in the forbidden kingdom of Poloz Silver-Gold, unravel the secret of her grandmother's emerald, stop the plans of the mafioso Mr. E. and come to terms with the fact that she still has to become an adult.