The follow up novel to The Blood of the Gods. Renault Lefevre and Constance de la Rochefoucauld have found the first Sword of Fate, Durendal, beneath the ancient floors of the Hagia Eirene in Constantinople. With their former foe Emilie now possessed, they face a new, more deadly threat from the Host as they search for the second Sword of Fate, the Sword of Mars, once in the possession of Attila the Hun. As the two lovers race across Eastern Europe to find the sword Emilie races to free herself from her prison to try and help her former enemies defeat the greatest threat to humanity and freewill.

On the eve of the French Revolution a French soldier, Renault LeFevre, stumbles upon a secret society deep in the heart of Paris. Just as they are about to kill him for uncovering their organization they discover something about Renault, something in his blood. Sparing his life and conscripting him into their ranks, the society sends Renault on a mission, collect three legendary swords. Renault must navigate through a world on the edge of calamity to locate the legendary sword of Roland, Durandal. He races against the tidal wave of the Revolution he isn't the only one searching for the sword. With agents of the Europe's highest courts on his tail and little to no allies to lend assistance, Renault must find the sword before the European powder keg explodes.