A Roman Army. A Dacian Tribe. Werewolves. The Romans get slaughtered trying to colonize Dacian territory. This thrusts the elite Axius and famed hero Nestor into a painful reckoning that their fallen was not killed by humans. They embark on a journey to save their beloved commander, Titus, and the army, who undertake a mission to avenge their fallen. Axius believes the Dacian queen Vasiliki holds the key to uncovering the truth about the killers, as a plot seeking to undermine Rome from within is discovered. As they confront their worst fears, they realize this bloody war is already spilling into the streets of Rome. But the beasts in Dacia want more than Rome, they want the world.