Forbidden: The Sexual Art of Serial Killers Volume 2: Duality (The Forbidden Series) Hardcover – March 28, 2026

Evil does not announce itself. It performs.In The Sexual Art of Serial Killers, Volume 2: Duality, forensic sexologist and erotic art scholar Dr. Victoria Hartmann returns with a work that is both more expansive and more unsettling than its predecessor. Where Volume 1 asked whether the erotic art produced by serial killers could yield insight into their psychology and behavior, Volume 2 asks a harder question: how do individuals capable of sustained, ritualized sexual violence continue to exist — undetected — inside ordinary life? The answer, Hartmann argues, is not monstrous exceptionalism. It is duality.Duality is not rare. It is not pathological in isolation. It is, as Hartmann establishes from the opening pages, a condition of ordinary social existence. We compartmentalize, perform, and present curated versions of ourselves as a matter of survival and social function. What serial offenders do is not fundamentally different in mechanism — only in degree, and in consequence. They do not invent concealment. They exploit a cultural infrastructure already built to reward it.This reframing is the intellectual backbone of the book, and it is a genuinely significant one. The popular narrative around serial killers insists that signs were always present, that someone should have noticed, that monstrousness announces itself to those paying close enough attention. Hartmann systematically dismantles this comfortable fiction. Drawing on forensic psychology, sociology, clinical sexology, and an extraordinary range of primary source material — including the artwork, letters, photographs, and court records of the offenders examined — she traces how class, institutional trust, social performance, and the cultural normalization of compartmentalization combine to create conditions in which extreme harm can operate quietly, sometimes for decades.Throughout, erotic art — in its broadest sense, encompassing drawings, letters, self-photography, staged domestic environments, and written fantasy narratives — is treated neither as confession nor as camouflage by default. It is approached as trace: evidence that something passed through a mind, was shaped by a hand, and left behind for reasons not always accessible even to its creator. When the correspondence between art and crime is unmistakable, Hartmann notes it precisely. When it is absent, misleading, or impossible to interpret with confidence, she notes that too. The absence of correspondence, she argues, is itself forensically significant — it speaks to the depth and effectiveness of compartmentalization rather than the absence of interior life.This interpretive restraint is one of the book's most valuable qualities. In an area where sensationalism is the dominant mode and premature certainty is often mistaken for analytical confidence, Hartmann's willingness to hold ambiguity without collapsing it is both methodologically rigorous and intellectually honest.The Sexual Art of Serial Killers, Volume 2: Duality is the third book in a developing body of work that includes I Love Dead People: Inside the Minds of Death Fetishists (2016) and The Sexual Art of Serial Killers, Volume 1 (2024). It is essential reading for forensic psychologists, criminologists, clinical sexologists, and serious readers of narrative non-fiction who are prepared to engage with difficult material without the comfort of easy resolution.This book contains explicit discussion of sexual violence, homicide, paraphilic behavior, and forensic case material. It is intended for adult readers with a professional or serious scholarly interest in forensic sexology and criminal psychology. Read more