AD 265, Gaul - The Roman Empire is on the brink.Emperor Gallienus has amassed a huge army across the Alps to seize back the mountains from the usurper Postumus.War has come.Ballista and his cavalry are on the frontline, battling in the most brutal of conditions. But if he is to survive the campaign and finally retire to his beloved Sicily, it's not just the battlefield he needs to navigate.As he and Praetorian Prefect Volusianus lay siege to Postumus' armies, it becomes clear the greatest threat to Ballista's life might just come from within his ranks. After all, Volusianus has shown he will go to any distance for his own ends. Is Ballista just another pawn in his game?

Harry Sidebottom teaches Ancient History at Oxford University. His career as a novelist began with his Warrior of Rome series, which has sold over half a million copies. His next series, Throne of Caesars, was equally acclaimed.