该剧根据北欧剧集《The Bridge》改编，第一季为10集。故事描述英法海底隧道分界线上惊现一个法国政客的尸体，由此引发了一场席卷整个欧洲的政治危机。英法各自派出一名侦探（Stephen Dillane, Clemence Poesy）调查此事，他们发现凶手试图将现代社会「道德沦丧」的现象最大化。
边隧谜案 (季节 1)
Episode 1 6.7
播出日期: 2013-10-16
运行时间: 47 min
概述: British and French detectives are brought together when a body is discovered inside the Channel Tunnel.
Episode 2 7.2
播出日期: 2013-10-23
运行时间: 47 min
概述: While the killer's second 'truth' unfolds, Stephen Beaumont crosses the paths of Karl and Elise once more.
Episode 3 7.4
播出日期: 2013-10-30
运行时间: 47 min
概述: 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 7.5
播出日期: 2013-11-06
运行时间: 47 min
概述: 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 7.2
播出日期: 2013-11-13
运行时间: 47 min
概述: 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 5.8
播出日期: 2013-11-20
运行时间: 47 min
概述: 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 7.0
播出日期: 2013-11-27
运行时间: 47 min
概述: 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 7.0
播出日期: 2013-12-02
运行时间: 47 min
概述: 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 7.0
播出日期: 2013-12-09
运行时间: 47 min
概述: 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 7.2
播出日期: 2013-12-09
运行时间: 47 min
概述: 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.
季
集 10
集 8
集 6