"So this is a threat to you: when I find you, I will show you what I do to serial killers," a masked man who calls himself ShadowVision warned a suspected serial killer in Little Rock, Arkansas. "I am hunting you right now."
Authorities said they believe Keith Gibson killed two then robbed or assaulted three people in Delaware and tried to murder one of them over the following three days.
"The Case Of The Murderous Dr. Cream: The Hunt For A Victorian-Era Serial Killer" details one physician's poisonous killing spree that spanned two continents and helped shape modern medical ethics.