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 metal in her father's junkyard.

Her father distrusted the medical establishment, so Tara never saw a doctor or nurse. Gashes and concussions, even burns from explosions, were all treated at home with herbalism. The family was so isolated from mainstream society that there was no one to ensure the children received an education, and no one to intervene when an older brother became violent.