Sam Vincent has been called a narcissist and a manipulator by nearly everyone in his life, and he sets out to prove them wrong by getting himself formally tested for psychopathy. The film follows him to forensic psychologists and researchers who put him through the standard tools of the trade, including the Hare Psychopathy Checklist and a brain scan designed to spot the neurological signatures linked to psychopathic behavior. Vincent narrates his own case with an unsettling amount of charm, walking the camera through relationships he has damaged and manipulations he treats almost as a game, which is itself part of what the experts are watching for. Interviews with clinicians lay out how psychopathy is actually diagnosed, moving the conversation away from the killers and con men of true-crime television and toward the quieter, more common version that might be sitting across from you at work. The test results, when they arrive, do not resolve the question as neatly as Vincent expects.