Spector's legal team are determined that he will never stand trial. Anderson and Ferrington make a discovery from the past that may help Gibson build her case.

Cast: Gillian Anderson, Krister Henriksson, Jamie Dornan, Chris Patrick-Simpson, Richard Clements, Aisling Franciosi, Gerard McCarthy, Andrea Irvine, Matthew Forsythe, Lacy Moore, Colin Morgan, Niamh McGrady, Aidan McArdle, Ruth Bradley, Conor MacNeill