In the spring of 1812, Napoleon Bonaparte was at the height of his powers. Forty-five million called him emperor, and he commanded a nation that was the richest, most cultured, and advanced on earth. No army could stand against his impeccably trained, brilliantly led forces, and his continued sweep across Europe seemed inevitable. Early that year, bolstered by his successes, Napoleon turned his attentions toward Moscow, helming the largest invasion in human history. Surely, Tsar Alexander’s outnumbered troops would crumble against this mighty force. But another powerful and ancient enemy awaited Napoleon’s men in the Russian steppes. Virulent and swift, this microscopic foe would bring the emperor’s progress to a halt. Even as the Russians retreated before him in disarray, Napoleon found his army disappearing, his frantic doctors powerless to explain what had struck down a hundred thousand soldiers. delves deep into the origins of the pathogen that finally ended the mighty emperor’s dreams of world conquest and exposes this “war plague’s” hidden role throughout history. A tale of two unstoppable forces meeting on the road to Moscow in an epic clash of killer microbe and peerless army, is a historical whodunit in which a million lives hang in the balance.