Britannia has been subdued - and an epic new chapter in Marcus Valerius Aquila's life begins. The murderous Roman agents who nearly captured Marcus have been defeated by his friends. But in order to protect those very friends from the wrath of the emperor, he must leave the province that has been giving him shelter. As Marcus Tribulus Corvus, centurion of the second Tungrian auxiliary cohort, he leads his men from Hadrian's Wall to the Tungrians' original home in Germania Inferior.

Fresh from their victory in Germania, Marcus Aquila and the Tungrians have been sent to Dacia, on the northeastern 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.

The seventh novel in Anthony Riches' acclaimed Empire sequence brings Marcus Aquila back to Rome, hunting the men who destroyed his family. But the revenge he craves may cost him and those around him dearly. The young centurion's urge to exact his own brutal justice upon the shadowy cabal of assassins who butchered his family means that he must face them on their own ground, risking his own death at their hands. A senator, a gang boss, a praetorian officer and, deadliest of all, champion gladiator Mortiferum - the Death Bringer - lie in wait.

The Tungrian auxiliary cohorts return to Hadrian's Wall after their successful Dacian campaign, only to find Britannia in chaos. The legions are overstretched, struggling to man the forts of the northern frontier in the face of increasing barbarian resistance. The Tungrians are the only soldiers who can be sent into the northern wastes, far beyond the long-abandoned wall built by Antoninus, where a lost symbol of imperial power of the Sixth Victorious Legion is reputed to await them.

The Battle of the Lost Eagle saved Hadrian's Wall, but the new Roman governor of Britannia must stamp out the rebellion of the northern tribes or risk losing the province. Rampaging south with sword and flame under the command of their murderous chieftain Calgus, they have stretched his forces to the limit. For Marcus - now simply Centurion Corvus of the 1st Tungrian cohort - the campaign has become doubly dangerous.