“The essential American soul,” wrote D.H. Lawrence in a celebrated description, “is hard, isolate, stoic, and a killer.” Of course, he was talking about Natty Bumppo and similar rough-and-tumble frontier spirits. By contrast, the amoral Tom Ripley—novelist Patricia Highsmith’s most famous character—is easygoing, devoted to his wife and friends, epicurean, and a killer only by necessity. By my count, necessity leads this polite aesthete to bludgeon or strangle eight people and watch with satisfaction while two others drown. He also sets in motion the successful suicides of three friends he actually, in his way, cares about. Yet aside from an occasional twinge about his first murder, Ripley feels no long-term guilt over these deaths. (Tellingly, he can never quite remember the actual number of his victims.) He was simply protecting himself, his friends and business partners, his home. Any man would, or at least might, do the same.