A new HLN investigative documentary series premiering Sunday, June 2, at 8 p.m. on HLN. "Hell in the Heartland" explores a harrowing missing persons case that is currently evolving into a much larger story of unsolved murder and allegations of cover-up and corruption in Welch, Okla. Crime author and investigator Jax Miller and former police investigator Sarah Cailean have been intrepidly researching the confounding case of Lauria Bible and Ashley Freeman, two teenagers who disappeared in December 1999, after the Freeman family trailer was burned to the ground. The series delves into the various strange theories and reveals a truth that proves even more incredible.