Inside the Channel Tunnel, on the borderline between Britain and France, the body of a woman is discovered. As the corpse is lifted it becomes clear that this is no ordinary murder. A thrilling and complex cross-Channel investigation ensues.

As Suze is recovering in hospital, the killer, nicknamed the "Truth Terrorist" by Hillier, calls Hillier to inform him he will continue the second truth in France, and later kidnaps a World War 2 veteran. Elise comes to understand that the Truth Terrorist is a mastermind, having covering his tracks thoroughly. What he does not account for is that a runaway teen couple accidentally find Jean-Claude, and are captured by the Truth Terrorist.