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 4 of 10
Detectives battle to locate an elderly soldier before he freezes to death. In the meantime, is naive teenager Sophie safe lodging with seemingly harmless Benji?