It is the year 824 when three peculiar characters - Paio the hermit, Teodomiro the bishop, and his assistant Martín de Bilibio - 'find' a tomb, the remains of which, they claim, belong to Saint James the Apostle. And so, in the Libredón forest, close to finis terrae or the end of the world, they create the Iocus Sancti Jacobi, for the greater glory of God. Two centuries later, a young noblewoman, Mabilia, who because of her evil uncle's greed must run away and hide in the world of men, decides to accompany Arno the stonemason on his search for La Inventio, in which the truth about the 'miraculous' find is told and whose whereabouts are hidden behind some carvings in the stone. During her pilgrimage she will learn of the construction of cities, monasteries, pathways and bridges, as well as the darker side of the stonemasons and their strange labour of 'pulling the soul from stones'.