446, Christian Era, a Pelagian monastery in the British archipelago, sees the arrival of Germain, a powerful bishop from Rome to verify that the monastic rules are well respected. During the excavations of the rooms, the monk Ninian will be eliminated from the theft of a manuscript prohibited by the dogma, referring to the stone of Fal. According to legends, the latter is the center of the universe, brought by the gods long ago, it is the key that leads an artefact offering its possessor full powers. This stone will be the object of all covetousness. Ninian manages to escape, but the emissary Germain discovers the existence of this stone and seeks to obtain it, with the aim of countering the Breton alliances. It is a war of power, but also a diplomatic one that will play out.
