France's greatest heroes face the terrible Vigilante of Peace to save the world!

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At a time when France leads the Industrial Revolution, Le Chevalier and Persa, her faithful squire, must overcome their differences with former enemies to face the blackmail of an evil adversary. The nations of the world raise their banners when warships are attacked and accusations of treason become harbingers of war.

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Irene Adler, the Committee's most famous thief, recruits the French agents as a last-ditch effort to capture the real enemy and prevent war. But all is not what it seems. The investigation leads to a terrifying scenario and, in the far reaches of Antarctica, the adventurers are forced to go down the same path as an ancient expedition from Miskatonic University. In the cryptic desert of ice and death, they must face their worst nightmares at the Mountains of Madness.

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Inspired by the writings by HP Lovecraft (At the Mountains of Madness), Edgar Alan Poe (The Narrative of Arthur Gordon Pym of Nantucket), and Jules Verne (The Sphinx of the Ice Realm), this volume portrays the adventures of the greatest heroes of a Victorian steampunk world in a story full of action and mystery.