In this exciting true crime documentary series, detectives and prosecutors return to the toughest murder cases of their careers.As the dusty file was opened again, one by one, one confusing case was back on the surface, which was chilling.The retrospective of every detail and the retrial of testimony reveal the complex human nature and thrilling truth hidden behind the case.This is not only a pursuit of justice, but also a psychological journey to face darkness and torture conscience.