Who shot Britain’s Health Secretary, and why?  After a 17-year absence, forensic pathologist and former professor Sam Ryan (Amanda Burden), returns to the Lyell Center, begging for help in the politically sensitive murder case.  But is that really what she wants?  Dr. Nikki Alexander (Emilia Fox, Signora Volpe) worries that the investigation could jeopardize the credibility of DNA and threaten everything the Lyell stands for.  Jack’s back, data’s missing, and the killer’s closing in.  Don your body armor for the BBC’s explosive 25th-anniversary season of Britain’s longest-running crime series.  One story - History - in 6 episodes.  4 1/4 hours on 2 discs. SDH