A fascinating work of detective history, The Black Death traces the causes and far-reaching consequences of this infamous outbreak of plague that spread across the continent of Europe from 1347 to 1351. Drawing on sources as diverse as monastic manuscripts and dendrochronological studies (which measure growth rings in trees), historian Robert S. Gottfried demonstrates how a bacillus transmitted by rat fleas brought on an ecological reign of terror — killing one European in three, wiping out entire villages and towns, and rocking the foundation of medieval society and civilization.