" 'I am a twenty-first century sociopath,' former therapist Gagne asserts in the introduction to her bracing debut, 'and I’ve written this book because I know I’m not alone.' She begins by recounting her childhood affinity for thievery and other early signs, including the excessive time she spent alone, that "something about me was off." As Gagne grew older, stealing trinkets gave way to stealing cars and credit cards, and in college, her first therapist diagnosed her as a sociopath. Reading all the material she could get her hands on, Gagne learned that the condition (characterized by "a disinclination to empathize with others") is widely misunderstood—and often misdiagnosed—and resolved to pursue a PhD in the subject to help others like herself"--