A desolate wasteland. A mission gone wrong. An impossible goal. Roman scout, Silus, is deep behind enemy lines in Caledonia. As he spies on a raiding party, he is abruptly discovered by an enemy chief and his son. Mounting a one-man ambush, everything quickly goes wrong and Silus must run for his life, the head of the enemy leader in his hands. Little does he know the price he will pay... As Silus is inducted into the Arcani, an elite faction of assassins and spies, he must return to Caledonia and risk everything in the service of his Caesar.

The first novel in Simon Scarrow's bestselling Roman series. It is 42 AD, and Quintus Licinius Cato has just arrived in Germany as a new recruit to the Second Legion, the toughest in the Roman army. If adjusting to the rigours of military life isn't difficult enough for the bookish young man, he also has to contend with the disgust of his colleagues when, because of his imperial connections, he is appointed a rank above them.

The Dacian kingdom and Rome are at peace, but no one thinks that it will last. Sent to command an isolated fort beyond the Danube, centurion Flavius Ferox can sense that war is coming but also knows that enemies may be closer to home. Many of the Brigantes under his command are former rebels and convicts, as likely to kill him as obey an order. And then there is Hadrian, the emperor's cousin, and a man with plans of his own.

The Romans invaded Britannia in AD 43 confident of victory. They swept through a divided and ill-equipped enemy, scattered across tough terrain. But one man was not prepared to surrender. Caratacus - quick-witted youngest son of a a tribal king - had been trained from birth to be a warrior of power and grit. Sent to be schooled by the Druids in his boyhood, his training meant that an already strong and cunning prince returned to his father's kingdom as a war machine.

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.