When his ship is taken and his crew slaughtered Tros of Samothrace is captured by Imperial Rome. Whilst his father is held hostage, Tros is coerced by Julius Caesar into helping find the best route for his assault on Britain. Tros must play a double game-he must try to save his father and encourage the British chieftains' resistance to thwart Rome and its legions-who are ready in Gaul to make the crossing to occupy their lands. Treachery, intrigue and assassination plots threaten, before Tros must accompany Caesar in his amphibious landing and its pitched battle in the surf.