When a prominent French politician is found dead on the border between the UK and France, detectives Karl Roebuck and Elise Wassermann are sent to investigate on behalf of their respective countries. However, the case takes a surreal turn when a shocking discovery is made at the crime scene, forcing the French and British police into an uneasy partnership.

As the killers second 'truth' comes to light, Karl and Elise cross paths with Stephen Beaumont again.

The team are faced with a race against time as the killer strikes again and this time it's a elderly victim.

Runaway teen Sophie puts her trust in Benji. Whilst the race is on to find a elderly pensioner before he freezes to death at the hands of the killer.

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.

Karl and Elise's suspicions are rested on Stephen Beaumont as the killers fourth truth begins, but are they chasing the right man?

The killer finally might have been caught as the fifth and final truth incites mob violence in England and France.

When Karl searches Danny's flat things start falling into place. Whilst the French police capture the prime suspect before losing him. Elise goes missing.

As the police get within a hair's breadth of catching the killer, things take a nasty turn for Karl.

The tense crime drama comes to an unmissable climax as Karl falls apart when the Truth Terrorist's change of direction becomes too much to bear.