In 1946, Marie Nyswander, a recent medical school graduate, joined the U.S. Public Health Service looking for adventure abroad. Instead, they sent her to Lexington, Kentucky’s Narcotic Farm, a prison and rehabilitation facility for people with drug addiction, where therapies included milking cows and basket-making. It was at Lexington that Marie encountered addiction for the first time, and what she saw there disturbed her—and reset her life’s course.