In 1957, when Amy Turner was four years old, her father had to be talked down from a hotel ledge by a priest. The story of his attempted suicide received nationwide press coverage, and he spent months in a psychiatric facility before returning home. From then on, Amy constantly worried about him for reasons she didn't yet fully understand, triggering a pattern of hypervigilance that would plague her into adulthood. In 2010, fifty-five years after...