The award-winning author of Clash of Eagles and Eagle in Exile brings his masterly alternate-history saga of the Roman invasion of North America to a stunning conclusion.

Roman Praetor Gaius Marcellinus came to North America as a conqueror, but after meeting with defeat at the hands of the city-state of Cahokia, he has had to forge a new destiny in this strange land. In the decade since his arrival, he has managed to broker an unstable peace between the invading Romans and a loose affiliation of Native American tribes known as the League.

But invaders from the west will shatter that peace and plunge the continent into war: The Mongol Horde has arrived and they are taking no prisoners.

As the Mongol cavalry advances across the Great Plains leaving destruction in its path, Marcellinus and his Cahokian friends must summon allies both great and small in preparation for a final showdown. Alliances will shift, foes will rise, and...