Thracia, AD30: Even after four years military service at the edge of the Roman world, Vespasian can't escape the tumultuous politics of an Empire on the brink of disintegration. His patrons in Rome have charged him with the clandestine extraction of an old enemy from a fortress on the banks of the Danube before it falls to the Roman legion besieging it. Vespasian's mission is the key move in a deadly struggle for the right to rule the Roman Empire....