The Tunnel

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 processThe Tunnel featuring Stephen Dillane and Clémence Poésy has one or more episodes streaming with subscription on Prime Video, available for purchase on iTunes, available for purchase on Google Play, and 4 others. It's an action & adventure and crime show with 24 episodes over 3 seasons. The Tunnel is no longer running and has no plans to air new episodes or seasons. It has a very high Rotten Tomatoes (critics) score of 91% and a high IMDb audience rating of 7.8 (6,872 votes).