Marcus responds to a plea from his brother to aid him in the far north. When pirates shut down the sea routes the legionnaire is forced to journey overland across the treacherous Sea of Grass. Yet this is not the safer choice. A mysterious shaman has sworn to drench the plains in blood and it will fall to Marcus to try to shepherd the caravan to safety.

Legion officer Marcus Venandus was exiled to the hell hole known as the Fire Islands as punishment for the sins of his father and finds all is not right at the edge of the world. The witchdoctor kings and their skeletal armies may be gone, but darkness lingers in the land. With the legion riven by personal rivalries, can Marcus and his men put the past back in its grave?