Elise Wasserman and Karl Roebuck investigate when a couple are abducted from the Channel Tunnel in front of their young daughter. Events take a dramatic turn when a plane crashes into the Channel.

The hunt for Madeleine becomes a matter of international urgency but Elise's investigation slows as she is forced to keep new evidence from Karl. Further links between the abduction and plane clash are discovered.

As the investigation continues and terrorists plan a further attack in France, a man comes forward with links to Robert. Elise uncovers disturbing facts about Eryka's past and Karl follows a hunch.

Karl and Elise receive a tip-off from a woman they believe knows Robert Fournier's whereabouts. But can she be trusted?

An unexpected revelation threatens to turn Karl's life upside-down. Meanwhile, Eryka reaches out to Elise and Rosa offers the team a cryptic clue.

An anonymous package gives Karl his biggest breakthrough in the case yet. Plus, the investigating team receive a clear and violent warning.

The team are forced to strike a deal with Vanessa. Meanwhile, someone tries to warn Karl off the case and Elise crosses a line she may quickly come to regret.

A lethal attack is launched and Elise and Karl's lives are thrown into jeopardy as the second series of the gripping crime drama ends in a nail-biting showdown.

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

While the killer's second 'truth' unfolds, Stephen Beaumont crosses the paths of Karl and Elise once more.

The police face a race against time to identify and capture the killer as he steps up his campaign, targeting a further elderly victim in his 'moral' crusade.

Karl and Elise battle to locate an elderly soldier before he freezes to death at the hands of the killer. Meanwhile, runaway teen Sophie puts her trust in Benji.

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 is he the correct 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.

In the cross-Channel crime thriller's penultimate instalment, events take a nasty turn for Karl as police get within a hair's breadth of catching the killer.

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.