Tara Westover was seventeen the first time she set foot in a classroom. Born to survivalists in the mountains of Idaho, she prepared for the end of the world by stockpiling home-canned peaches and sleeping with her head-for-the-hills bag. In the summer she stewed herbs for her mother, a midwife and healer, and in the winter she salvaged in her father's junkyard. The family was so isolated from mainstream society that there was no one to ensure the...