After their tribe is vanquished by the Attribates and their Strong Place occupied, Lubrin Dhu finds himself nominal leader of the survivors, his father and older brothers having been killed in battle. He strikes a bargain with the conquering chieftain, who will free Lubrin's people after completion of a monumental horse carved from the hillside. This figure becomes the Uffington White Horse. The novel's title reflects how the horse connects both the Solar attributes of the Attribates and the Lunar attributes of the Iceni, being considered an invocation to Epona. Lubrin Dhu ultimately voluntarily sacrifices himself for the consecration of the horse, fulfilling his duty as a chieftain's son, and offering a depiction of possible Celtic blood sacrifice.