Human civilization has disappeared. Reasonable rats took the place of people. The Inquisition sentences the young rat Tikhon to execution for the doctrine of the mysterious Ancestors who lived long before the Rat Intelligent. His girlfriend Belyanka is given to the oligarch Gnilozub as a harem. Rat City is convulsed by the thrusts of a dragon that engulfs the land with a giant tail. Quiet and Belyanka escape to escape and find the precious sea glass. However, insidious pirates are already waiting for them, and the dragon is scouring the depths, looking for prey...