To Aleisis and her sisters, the Pedagogue is their God, their father, their tormentor, and their lover. But who is their mother? Well, let's just say she is the feces, the excrement, of the Renavid district.

Pieced together from DNA woven from several dozen species, Vegan, Metz, Phoye and Aleisis are the end products of the Pedagogue's experiments. Hidden from society, their entire world is the sewers' maze. "You are safe here," the Pedagogue tells them, warning them of the dangers Above. Yet in his hands, they suffer as they are injected with substances while the Pedagogue impassively watches them react to the agents.

Until they can take it no more.

Lying in a pool of blood, the Pedagogue needs help and the four sisters will only find it by going to the place they have only read about. Above.

Is the world really dangerous for them, or are they dangerous to the world?