Author Marissa A. Harrison, a long-time research psychologist, describes her journey to writing Just as Deadly: The Psychology of Female Serial Killers. She recounts her pathway to conducting research on female serial killers (FSKs) and broadly introduces the concepts, content, and approach to writing this book. She describes her work with fellow researchers in various explorations of the psychology of serial murder and introduces her published work in scientific journals such as Evolutionary Behavioral Sciences, The Journal of Forensic Psychiatry and Psychology, and Current Psychology. Harrison describes her team’s work on morbid curiosity and protective vigilance, thought to motivate the great interest in serial murder. Included is a case study of Amy Archer-Gilligan to illustrate how FSKs can be just as deadly as male serial killers (MSKs). The author underscores the mandate for proper attribution of others’ work in scientific writing and her endeavors to provide extensive documentation for all factual information in this book to ensure a science-based presentation.