Human civilization has disappeared. The place of people was taken by intelligent rats. The Inquisition sentences the young little rat Quiet to execution for talking about the mysterious Ancestors who lived long before the Intelligent Rat. His girlfriend Belyanka is given to the harem of the oligarch Rottooth. The rat city is shaking from tremors: the earth is being shaken by a dragon, engulfing the land with a giant tail. Tikhonya and Belyanka run away to escape and find precious sea glass. However, pirates hungry for profit are already waiting for them, and the dragon is prowling the underwater depths, looking for prey... Science fiction and adventure for high school age.