Two agents must cooperate on behalf of their respective nations to investigate the murder of a well-known French politician discovered dead on the French-U.K. border.
A British and a French detectives are brought together when a body is found inside the Channel Tunnel.
A killer releases a video revealing the first of five truths. The second truth is revealed, and a detective investigates a missing person case.
Police race to capture a serial killer as he steps up his campaign, targeting an elderly victim in his "moral" crusade.
French and British police try to locate a soldier before he freezes to death at the hands of a killer, while a teen places her trust in a man.
The Truth Terrorist's third truth begins as Benji carries out his Samurai mission. The police hope to use teenage runaway Sophie to help trap the killer.
As the killer's incendiary fourth truth begins, Karl and Elise's suspicions fall on Stephen Beaumont; a manhunt begins, but Beaumont may be the wrong suspect.
Police think they may finally have a lead as the serial killer's actions escalate in his fifth and final 'truth', inciting mob violence in England and France.
French police capture but then lose the prime suspect before Elise mysteriously disappears. As Karl searches Danny's flat, things start to fall into place.
Police trace Kieran's bank records following his supposed death; Adam sneaks out to meet with his online girlfriend.
Kieran kidnaps Adam, and leads Karl on a number of dead ends to mentally torture him; Elise finds that Kieran was a Peloton operative.
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