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The Parable of the Knocker is a nonfiction book about the investigation, prosecution, and trial of a notorious serial killer, Charles Severance. Severance committed his crimes in the City of Alexandria, Virginia, an affluent, historic community just miles south of Washington, DC. Over the course of a decade, Severance ambushed three outstanding Alexandria residents in their middle-class neighborhood by knocking on their front doors in broad daylight and shooting them unexpectedly when they answered the knock.

In 2018, police announced that they had finally arrested the "Golden State Killer," a man responsible for over 140 burglaries, fifty rapes, and at least thirteen murders committed in California throughout the 1970s and '80s. That man turned out to be a former California police officer, Joseph James DeAngelo Jr. Just two months earlier, the publication of I'll Be Gone in the Dark by Michelle McNamara had rocked the world of true crime.