It is AD 55. As trouble brews on the eastern fringes of the Roman Empire, Prefect Cato and Centurion Macro prepare for war...

The wily Parthian Empire has invaded Roman-ruled Armenia, ousting King Rhadamistus. The King is ambitious and ruthless, but he is loyal to Rome. General Corbulo must restore him to power, while also readying the troops for war with Parthia. Corbulo welcomes new arrivals Cato and Macro, experienced soldiers who know how to knock into shape an undermanned unit of men ill-equipped for conflict.

But Rhadamistus's brutality towards those who ousted him will spark an uprising which will test the bravery of the Roman army to the limit. While the enemy watches from over the border...