The Tunnel (2013)

Detectives Karl Roebuck and Elise Wasserman join forces to investigate a chilling murder case that begins when a French politician's upper body and a British prostitute's lower half are discovered in the Channel Tunnel, straddling the border between France and the UK. As they delve deeper into the investigation, they uncover the twisted motives of the killer, dubbed the "Truth Terrorist." This enigmatic figure is on a disturbing mission to expose societal issues, leaving a trail of fear and chaos across both nations while challenging the detectives to confront moral dilemmas of their own.