When a French politician’s body is found inside the Channel Tunnel on the border between the UK and France, detectives Karl Roebuck (Stephen Dillane) and Elise Wassermann (Clémence Poésy) investigate on behalf of their respective countries.

Part 8 of 10
French police capture but then lose the prime suspect. Then, their lead detective goes missing. Though things eventually start to fall into place, something is troubling Karl.