The dark and lifeless surface of the Flat Earth is inhabited only at the foot of the mountains. Few inhabitants inhabiting the endless underground networks of caves make it to the surface and explore the world around them. The only city in the Upper World, Darktown, is precisely such a settlement. It is here, in this godforsaken place, that dramatic events are destined to unfold that will affect the destinies of all the underground principalities. And at the center of these events will be three inseparable friends, who are united by one childish and naive, but at the same time high and noble dream, for the sake of which they are ready to risk everything.