Technological progress, like authoritarian regimes, is insidious. Nothing big changes all at once; instead, a steady stream of smaller, less threatening changes occur over time. These alterations don’t sound alarm bells precisely because they blend into the fabric of our everyday lives. It is only when viewed en masse, through the prism of history, that it all appears to have been leading to an unwelcome outcome. Kevin Byrnes’s chilling nonfiction thriller, Harvest, affords us that crucial step back.