In 1983, visitors to Yosemite National Park found a decaying human hand in Summit Meadow. Investigators Don Coelho and Kim Tucker work for months but find no clues, no missing person reports or other remains. Then suddenly, they learn Henry Lee Lucas, a Texas serial killer, is saying he killed victims in a California national park. As Lucas claims more and more murders, Don and Kim begin looking at him for their case and prepare to meet and interview Lucas in person.