In 1953, 15-year-old Evelyn Hartley left to babysit a neighbor's child \u2013 but she never came home. Following a trail of bloodstains and clothing scraps, police led a fruitless search for her killer. Today, some believe Evelyn might've been the victim of one of the most terrifying serial killers in American history.\nLearn more about your ad choices. Visit podcastchoices.com/adchoices