The hunt for Madeleine becomes a matter of international urgency but Elise's investigation slows as she is forced to keep new evidence from Karl. Further links between the abduction and plane clash are discovered.

As the investigation continues and terrorists plan a further attack in France, a man comes forward with links to Robert. Elise uncovers disturbing facts about Eryka's past and Karl follows a hunch.

Karl and Elise receive a tip-off from a woman they believe knows Robert Fournier's whereabouts. But can she be trusted?

An anonymous package gives Karl his biggest breakthrough in the case yet. Plus, the investigating team receive a clear and violent warning.