Ex-detective Mark Williams-Thomas carries out the first active TV investigation into the German paedophile Christian B since he became the prime suspect in the Madeleine McCann case. In a world exclusive, he tests the account given by Christian B himself.
The German authorities say they have evidence that Maddie is dead and that Christian B is guilty of her murder but they also say there isn't enough evidence to prosecute him. Mark already has new information - he has secured interviews with his accusers, former friends, neighbours and associates - some of whom have never spoken to the media before. As he discovers evidence that could turn the story on its head, was Christian B responsible for abducting Madeleine? This series is poised to offer the most definitive answer yet.