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By the early ninth century, the Carolingian empire was at the height of its power. The Franks, led by Charlemagne, had built the largest European domain since Rome in its heyday. Though they jockeyed for power, prestige, and profit, the Frankish elites enjoyed political and cultural consensus. But just two generations later, their world was in shambles. Civil war, once an unthinkable threat, had erupted after Louis the Pious’s sons tried to overthrow him—and then placed their knives at the other’s neck. Families who had once charged into battle together now drew each other’s blood.

The Sleepwalkers is historian Christopher Clark's riveting account of the explosive beginnings of World War I. Drawing on new scholarship, Clark offers a fresh look at World War I, focusing not on the battles and atrocities of the war itself but on the complex events and relationships that led a group of well-meaning leaders into brutal conflict.