A Fever in the Heartland: The Ku Klux Klan's Plot to Take Over America, and the Woman Who Stopped Them by Timothy Egan is a narrative non-fiction book (often released in hardcover) that chronicles the rise and fall of the Ku Klux Klan in the 1920s Midwest. The book focuses on the Klan’s surprising, massive influence outside the South—particularly in Indiana—and the actions of a single woman, Madge Oberholtzer, whose deathbed testimony brought down its leadership.