Criminal profiling has been with us for several decades and the narrative is heavily focused upon the 'nature vs. nurture' debate as opposed to trying to understand the psychological, biological, and social factors of the individuals that commit some of the world's most despicable and heinous crimes. Serial killers and serial offenders are the monsters who haunt our nightmares and although they exist silently among us, we are still no closer to fully understanding them as individuals. What made Ted Bundy kill young middle-class women? What made Peter Sutcliffe kill women from different social strata? What made Thomas Hamilton commit a mass murder against innocent school children? These are the pertinent questions that are constantly stymied by simply discussing the 'nature vs. nurture' debate. This book seeks to move the boundaries of this debate to provide a more dynamic approach to the art and theory of the discipline of profiling serial killers and prolific and repeat offenders. Dark Psychosis: Profiling Serial Killers & Prolific Offenders focuses on the darkest psychological traits of the individual perpetrators whether they are resultant from nature, nurture, or a combination of both. This book can be used as a resource for students, amateur sleuths, and those with a general interest in criminal psychology and criminal profiling.