2006: Tony and Emily's pleas to reinvestigate a suspect again fall on deaf ears. Tony decides to take matters into his own hands and has a violent confrontation with life-changing consequences. In the present day, Tony and Julien retrace their steps in Paris as they try and find out the whereabouts of a man who they believe to be involved with Oliver's disappearance.
Elenco: David Morrissey , Keeley Hawes , Abigail Hardingham , Tchéky Karyo , Anastasia Hille , Roger Allam , Laura Fraser , Lia Williams .