Fresh from their victory in Germania, Marcus Aquila and the Tungrians have been sent to Dacia, on the north-eastern edge of the Roman Empire, with the mission to safeguard a major source of imperial power. The mines of Alburnus Major contain enough gold to pave the road to Rome. They would make a mighty prize for the marauding Sarmatae tribesmen who threaten the province, and the outnumbered auxiliaries are entrusted with their safety in the face of a barbarian invasion. Beset by both the Sarmatian horde and more subtle threats offered by men who should be their comrades, the Tungrians must also come to terms with the danger posed by a new and unexpected enemy. They will have to fight to the death to save the honour of the empire-and their own skins.