Psychotherapeutic work with a patient who has committed a crime of infanticide allows us to reflect on the psychic processes involved in the transformation of love into hate. With reference to Freud’s research, the guilt linked to the act of crime is found in the fantasy of fulfilling an unconscious wish in connection with what is forbidden. Narcissism occupies a central place in drive fusions/defusions. In the context of physical restraint, the body constitutes an intermediate object between love and hate. However, in infanticide, the ego targets the object insofar as the murder of the child will lead to the murder of the mother. What is the fate of the vicissitudes of the drives after the act? Is the psychoanalyst able to maintain a symbolic framework and free-floating listening in extreme clinical situations? How can he or she hear, in a murderous act, the unconscious guilt of the subject who lays claim to his innocence as a wounded child?