“I ate his heart,” were the first words said to author and psychologist Nathalie von Zelowitz during an interview with a man convicted of killing and cannibalizing another man. Between 2011 and 2021, French prison psychologist Nathalie von Zelowitz met regularly with a man who had been sentenced to a high-security psychiatric facility for a homicide and an act of cannibalism. Unlike most defendants in such cases, the man was found mentally sound and legally responsible for his actions and received a criminal sentence. I Ate His Heart  is a true crime confessional like no other—a darkly philosophical interrogation into the meaning of love, desire, and annihilation. This is not a Hannibal Lecter thriller. Von Zelowitz’s work explores the internal logic of the crime from the perpetrator’s perspective. Using firsthand interviews, reconstructed dialogue, and excerpts from the subject’s writing, she presents a detailed account of the psychological, philosophical, and emotional framework that led to the killing. She neither sensationalizes nor excuses. Instead, she allows the subject’s words and justifications to speak for themselves, offering readers a rare view into a case that defied common explanations of psychosis or insanity. Originally published in France to critical acclaim, I Ate His Heart arrives in English for the first time— a chilling, cerebral, and elegantly disturbing book that questions whether understanding evil can ever leave you unchanged. Perfect for readers of : My Dark Places by James Ellroy, The Adversary by Emmanuel Carrère, Come and See by Sarah M. Broom, American Psycho by Bret Ellis Easton, The Cannibal by John Hawkes, Without Conscience by Robert D. Hare,  Mindhunter by John Douglas,  The Anatomy of Evil by Michael H. Stone. . .and those drawn to literary horror, transgressive psychology, and criminal obsession. Inside you’ll find… Details of a criminal case involving consensual homicide and cannibalism. Expert analysis and insights by a prison psychologist with ten years of direct access to the subject. Includes reflections on criminal responsibility, consent, identity, and pathology. Relevant for readers interested in forensic psychology, criminal justice, and abnormal behavior.