Emperor Valens juggles the paltry border defences to stave off invasion from the Goths north of the Danube. Meanwhile, in Constantinople, a pact between faith and politics spawns a lethal plot that will bring the dark and massive hordes from the east crashing down on these struggling borders. The fates conspire to see Numerius Vitellius Pavo, enslaved as a boy after the death of his legionary father, thrust into the limitanei, the border legions, just before they are sent to recapture the long-lost eastern Kingdom of Bosporus. He is cast into the jaws of this plot, so twisted that the survival of the entire Roman world hangs in the balance…