Western Pyrenees, year 778. When his land is threatened by the ruthless armies of the Frankish emperor, a Basque warlord asks for help from his ancestral gods.

In the mountains of the Basque Country, a mother and her daughter take shelter in a ruined hut that seems uninhabited.

A mysterious place, an indescribable prison, a deep hole. An unknown number of levels. Two inmates living on each level. A descending platform containing food for all of them. An…