Here an attempt is made to detect psychopathy in all its danger, but also in its tragedy. Guggenbühl-Craig aims to help identify psychopaths, to protect themselves from them, and to understand their suffering. The author reviews the field, gives an explanation of the main symptoms, suggests an approach to treatment, and then presents a new vision: psychopathy is not so much a deficiency of morality as it is crippled Eros.