British and French detectives are brought together when a body is discovered inside the Channel Tunnel.

The serial killer steps up his cross-Channel campaign targeting a further elderly victim in his "moral" crusade. The race is on for police in Britain and France to identify and capture the murderer before more lives are brutally lost.

Detectives battle to locate an elderly soldier in the fourth episode of this thrilling drama. In the meantime, is naive teenager Sophie safe lodging with seemingly harmless Benji?

The killer'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 youths are burnt alive, police suspect the hand of the Truth Terrorist once more. They finally make a key arrest. Will this be the end of the killings in this brilliantly tense Anglo-French thriller?

Police think they may finally have a lead, as the serial killer's actions escalate in his fifth and final "truth." Karl and Laura's relationship takes another turn as Laura steps up her flirtations with another man.

French police capture but then lose the prime suspect. Next, their lead detective goes missing. Things eventually start to fall into place, but something is troubling Karl.

Things take a very nasty turn for Karl as police get within a hair's breadth of catching the killer. Will they make it in time?

Karl falls apart in the final episode as the Truth Terrorist's change of direction becomes too much to bear. What will be the cost of catching their man? A hair-raising showdown begins.