Gaius Valerius Verrens returns to Rome from the successful campaign against Boudicca in Britain. Now hailed a ‘Hero of Rome’, Valerius is not the man he once was – scarred both physically and emotionally by the battles he has fought, his sister is mortally ill, his father in self-imposed exile. And neither is Rome the same city as the one he left. The Emperor Nero grows increasingly paranoid. Those who seek power for themselves whisper darkly in the emperor’s ears.

'The story I now commence is rich in vicissitudes, grim with warfare, torn by civil strife, a tale of horror even during times of peace.’ Tacitus, The Histories AD 68. The Emperor Nero’s erratic and bloody reign is in its death throes when Gaius Valerius Verrens is dispatched to Rome on a mission that will bring it to a close. With Nero dead, the city holds its breath and awaits the arrival his successor, Servius Sulpicius Galba, governor of Hispania. The Empire prays for peace, but it prays in vain.

Emperor Nero’s grip on power is weakening. In every shadow he sees an enemy and like a cornered animal he lashes out at every perceived threat. His paranoia settles on the figure of Gnaeus Domitius Corbulo, Rome’s greatest General who leads the imperial legions in the East. So popular is Corbulo with his men that he effective presides over an Empire within an Empire. Is Corbulo preparing to march against Rome and take the purple?

Veteran cavalry commander Marcus Flavius Victor sets out with his regiment to make what may be his final tour of the forts along Hadrian's Wall. Through a combination of military prowess, brutality and bribery, Marcus has spent 20 years keeping the savage Picts at bay. Feared by his enemies and hated by his superiors, his strength of will is the only thing that has held the disgruntled, poorly paid garrisons of the Wall in place as the failing Roman Empire's grip on Britannia weakened.

Rome, AD 68. Nero has committed suicide. One hundred years of imperial rule by the descendants of Julius Caesar has ended, and chaos rules. His successor, Galba, dismisses the incorruptible Germans of the Imperial Bodyguard for the crime of loyalty to the dead emperor. Ordering them back to their homeland, he releases a Batavi officer from a Roman prison to be their prefect. But Julius Civilis is not the loyal servant of empire that he seems.