The Parable of the Knocker: The True Crime Story of a Prosecutor's Fight to Bring a Serial Killer to Justice

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. Severance was not personally acquainted with any of his victims, and instead selected his targets to revenge perceived wrongs and terrorize a community.