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 3)
Episode 1 (集 1) 7.5
编剧: Emilia di Girolamo
播出日期: 2017-12-14
运行时间: 47 min
概述: A burning fishing boat found on the Channel turns into a new case for Karl and Elise in the third and final chapter of the series.
Episode 2 (集 2) 7.5
编剧: Louise Ironside
播出日期: 2017-12-21
运行时间: 48 min
概述: A shocking discovery is made at an immigration removal centre alongside a sinister animation containing a hidden message.
Episode 3 (集 3) 8.0
编剧: Jamie Crichton
播出日期: 2017-12-28
运行时间: 47 min
概述: The investigation steps up when Winnie is sent a live rat in a box, with a set of co-ordinates leading to the Pied Piper’s latest victim. Meanwhile, Karl’s disapproval turns to concern when he learns the extent of Elise’s distress over the Moreau case. In English and French
Episode 4 (集 4) 7.0
编剧: John Jackson
播出日期: 2018-01-04
运行时间: 52 min
概述: As a young mother-to-be helps Karl and Elise with their enquiries a new development threatens to tear the pair's partnership apart.
Episode 5 (集 5) 7.0
编剧: Emilia di Girolamo
播出日期: 2018-01-11
运行时间: 50 min
概述: Karl makes a foreboding discovery at Elise’s apartment, and the pattern of missing people continues.
Episode 6 (集 6) 8.0
编剧: Emilia di Girolamo
播出日期: 2018-01-18
运行时间: 51 min
概述: In the final episode, Karl and Elise face a tense and gripping showdown with the Pied Piper, while the truth about the Moreau abduction is revealed at last.
季
集 10
集 8
集 6