The Tunnel (Season 1)

The plot follows detectives Karl Roebuck and Elise Wasserman working together to find a serial killer who left the upper-half body of a French politician and the lower-half of a British prostitute in the Channel Tunnel, at the midpoint between France and the UK. They later learn that the killer—who comes to be nicknamed the "Truth Terrorist"—is on a moral crusade to highlight many social problems, terrorising both countries in the process

Episode 1 (Episode 1) 6.7
Air date: 2013-10-16
Runtime: 47 min
Overview: British and French detectives are brought together when a body is discovered inside the Channel Tunnel.
Episode 2 (Episode 2) 7.2
Air date: 2013-10-23
Runtime: 47 min
Overview: While the killer's second 'truth' unfolds, Stephen Beaumont crosses the paths of Karl and Elise once more.
Episode 3 (Episode 3) 7.4
Air date: 2013-10-30
Runtime: 47 min
Overview: 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.
Episode 4 (Episode 4) 7.5
Writer: Chris Lang
Air date: 2013-11-06
Runtime: 47 min
Overview: 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.
Episode 5 (Episode 5) 7.2
Air date: 2013-11-13
Runtime: 47 min
Overview: 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.
Episode 6 (Episode 6) 5.8
Air date: 2013-11-20
Runtime: 47 min
Overview: 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?
Episode 7 (Episode 7) 7.0
Air date: 2013-11-27
Runtime: 47 min
Overview: 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.
Episode 8 (Episode 8) 7.0
Air date: 2013-12-02
Runtime: 47 min
Overview: 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.
Episode 9 (Episode 9) 7.0
Writer: Chris Lang
Air date: 2013-12-09
Runtime: 47 min
Overview: 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.
Episode 10 (Episode 10) 7.2
Air date: 2013-12-09
Runtime: 47 min
Overview: 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.