“Psychopaths are distinguished by two characteristics. The first is a ruthless disregard for others: they will defraud, maim, or kill for the most trivial personal gain. The second is an astonishing gift for disguising the first. It’s the deception that makes them so dangerous. You never see him coming. (It’s usually a him—more than 80 percent are male.) Don’t look for the oddball creeping you out. Psychopaths don’t act like Hannibal Lecter or Norman Bates. They come off like Hugh Grant, in his most adorable role.”