Britannia after the defeat of the northern tribal alliance. The Tungrian auxiliaries expect their campaign to end, but vengeance and unfinished rebellion continue beyond the Roman frontier. Marcus Valerius Aquila remains both a soldier of the empire and a fugitive from it.
The hunt for surviving enemies leads the regiment through forts, patrol routes and hostile country where Roman authority is thin. Marcus must balance loyalty to his comrades with the danger that his concealed identity will be discovered by men who would rather use him than protect him.