The plot follows the two detectives working together to find a serial killer who left the upper half of a French politician and the lower half of a British prostitute in the Channel Tunnel at the midpoint between France and the UK. The killer is nicknamed the "Truth Terrorist" and is on a moral crusade to highlight many social problems, terrorising both countries in the process. As the series progresses, the killer's true intention is revealed.
Tunnel head writer Ben Richards worked with Hans Rosenfeldt, the creator of the original series. It was produced with both British and French crew members.
Some reviewers made favourable comparisons with The Bridge , though others criticised The Tunnel for being identical. The producers admit that the first episode is a copy of the original. The renewal for a third and final series was announced on 20 January [ 11 ] [ 12 ] entitled The Tunnel: Vengeance and consisting of six episodes. Elise shares some characteristics with Saga, including driving a Porsche in Elise's case, a Porsche , picking up men from bars for casual sex , and exhibiting behaviour consistent with Asperger syndrome.
The series includes several guest stars. Keeley Hawes guest-starred as Suze Harcourt, a care worker and drug addict, along with Liz Smith , who plays Harriet, an elderly woman under Harcourt's care. James Frain plays Kieran Ashton "John Sumner" , a former colleague of Karl, who faked his suicide and became the Truth Terrorist, serving as the primary antagonist of the first season and a behind-the-scenes antagonist in the second season.
The character is motivated by the loss of his identity and family, as well as betrayal from Karl by his affair with Kieran's wife before her death. Frain believed that Kieran is the most disturbing character he has played. Portraying the character, the actor wanted to make his actions understandable, though not justifiable. Due to the setting of the series, it would be bilingual, with dialogue being spoken in English and French. We're neighbours, we have so much in common and yet we're thousands of miles apart on so many things.
