It's hard to believe, but this year marks a decade since Madeline McCann vanished in what has made for one of the most infamous missing child stories of all time. The little girl disappeared from her holiday apartment when the family were in Portugal and to this day there has been no explanation for what happened to her.

With unprecedented access, this documentary looks at Operation Omega, the secret search to find Madeleine McCann in 2008. However, the investigation was set up by security consultant Kevin Halligen who it transpired was not a spy but one of the world’s most audacious conmen. Featuring information and evidence never before seen or heard, including an interview with Halligen himself, this documentary tells an untold story about the search for Madeleine McCann.